Costco Blueberry Muffin Recipe – Easy Kitchen Guide

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By Dr. Leah Alexander | Published on October 3, 2023 | Last Updated on November 9, 2023

Indulge your taste buds with the heavenly delight of Costco’s blueberry muffins, now easily replicable at home! With a perfect blend of juicy blueberries these jumbo muffins are a treat to relish. They boast golden crispy domes and soft interiors that make every bite a delicious surprise.

So, put on your apron and get ready to bake your way to a delightful morning with these Costco-inspired blueberry muffins. We’ll walk you through the steps and baking tips to make sure you don’t miss out on any detail!

Costco Blueberry Muffin Recipe

What is a Costco blueberry muffin?

The Costco blueberry muffin is a jumbo-sized treat that’s perfect for breakfast or dessert. Made with fresh wild blueberries, these muffins are soft and moist on the inside and have a crispy golden top. The addition of oats to the batter gives it an extra crunchy texture while also adding to its nutritional value.

The unique combination of flavors gives it an irresistible taste that has made it a favorite snack for both kids and adults alike. Made from a simple mixture of flour, sugar, butter, eggs, baking powder, salt, and blueberries, these muffins are easy to make at home with the right ingredients.

How did I first get introduced to the Costco blueberry muffin?

My introduction to the Costco blueberry muffin was a little roundabout. I had heard about it from a friend, who had visited the store and tried one for themselves. They were raving about how delicious they were and kept talking about them incessantly. Being an avid baker myself, I knew I had to try out the recipe as soon as possible.

The next time I visited the store, I looked for the muffin stand and found it easily. It was a jumble of colorful baked goods neatly arranged on trays. The blueberry muffins were exactly how my friend had described them – large, golden brown, and loaded with fresh blueberries.

I bought two muffins, one for me and one for my friend. When I tasted the first bite, I was in love! The crispy dome gave way to a soft moist interior that was packed with fresh blueberries. The sweetness of the berries balanced out the slight savouriness of the muffin batter perfectly.

I couldn’t resist finishing both muffins on the spot and I knew then that I had to try and replicate this recipe at home. After a few rounds of trial and error, I finally got the recipe just right.

Baking Costco blueberry muffins has become a regular activity in my household ever since. My family loves it when they come out of the oven smelling like sweet, warm heaven! And everyone enjoys devouring them while they are still warm – with a dash of butter and a bit of honey on the side.

Making these muffins is easy and fun, and I am sure that you will love them as much as I do! With this simple recipe, you can now enjoy your own Costco blueberry muffin at home.

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Ingredients that you’ll need

  1. All-Purpose Flour: This is the foundation of your muffins. It provides the structure and acts as a kind of ‘glue’, binding all the ingredients together in a cohesive dough. It’s called ‘all-purpose’ because it has a balanced protein content that makes it suitable for a wide range of baked goods.
  2. Granulated Sugar: Sugar does more than just sweeten the muffins. It also helps to tenderize the muffins by absorbing water and slowing down the formation of gluten from the flour. Additionally, sugar aids in browning and gives the muffins a nice golden color.
  3. Salt: Salt enhances the flavor of other ingredients. It’s like a flavor amplifier. Without it, the muffins might taste flat and uninteresting.
  4. Baking Powder: This is a leavening agent that creates air bubbles in the batter as it cooks, causing the muffins to rise and become fluffy. Without baking powder, you’d end up with flat, dense muffins.
  5. Unsalted Butter: Butter adds richness, flavor, and moisture to the muffins. Using unsalted butter allows you to control the amount of salt in the recipe.
  6. Eggs: Eggs play multiple roles in baking. They add moisture, help bind the ingredients together, and contribute to the leavening process. The proteins in eggs are set during baking, giving the structure of the muffin.
  7. Milk: Milk adds moisture to the batter, helping to combine the dry and wet ingredients. It also contributes to the flavor and nutrition of the muffins.
  8. Vanilla Extract: Vanilla extract adds a depth of flavor that complements the sweetness of the muffins. It’s a background note, but one that would be missed if left out.
  9. Fresh Blueberries: These are the stars of the show! In addition to their delicious flavor and attractive appearance, blueberries add moisture and natural sweetness to the muffins. When they cook, they burst, creating pockets of juicy goodness that make these muffins a delight to eat.

How to make a Costco blueberry muffin?

Making a Costco blueberry muffin is easy and rewarding! All you need is a few simple ingredients, some basic kitchen equipment, and a little bit of patience and skill.

When making these muffins, you’ll want to take your time and follow the instructions closely. All of the ingredients are important, but none more so than fresh blueberries. Be sure to select plump berries with a vibrant color for maximum flavor and texture.

Once all of the ingredients have been measured and combined, you’ll be ready to bake!

Costco Blueberry Muffin Copycat Recipe

Step-by-step directions

Step 1: Preheat the Oven

Begin by preheating your oven to 350 degrees Fahrenheit (175 degrees Celsius). This ensures that the oven is at the correct temperature for baking your muffins.

Step 2: Prepare the Muffin Pan

Take a muffin pan and lightly grease it with either butter or cooking spray. This step prevents the muffins from sticking to the pan and makes for easier removal once they’re baked.

Step 3: Prepare Dry Ingredients

In a medium-sized bowl, combine the dry ingredients. This includes the flour, sugar, salt, and baking powder. Thoroughly whisk them together to ensure even distribution. Set this dry mixture aside for later use.

Step 4: Cream the Butter and Eggs

In a separate bowl, take the softened butter and eggs. Cream them together until the mixture becomes light and fluffy. This step is essential for creating a tender and moist muffin texture.

Step 5: Combine Wet and Dry Ingredients

Gradually introduce the dry ingredients mixture into the bowl with the creamed butter and eggs. Stir these ingredients together until they are combined. Overmixing can lead to tough muffins, so it’s important not to overdo it.

Step 6: Fold in Blueberries

Carefully fold the blueberries into the muffin batter. This step should be done gently to avoid crushing the blueberries, and it ensures even distribution throughout the batter.

Step 7: Fill the Muffin Pan

Using a spoon or scoop, portion the muffin batter into the prepared muffin pan. Aim to fill each cup about two-thirds full. This allows the muffins to rise and form their characteristic domed tops during baking.

Step 8: Bake the Muffins

Place the muffin pan in the preheated oven and bake for approximately 18-20 minutes. To check for doneness, insert a toothpick into the center of a muffin. If it comes out clean or with just a few crumbs clinging to it, the muffins are done.

Step 9: Cool the Muffins

Once baked, allow the muffins to cool in the pan for about 10 minutes. This makes them easier to handle and prevents them from falling apart when removed from the pan. Afterward, transfer the muffins to a wire rack to cool completely.

What does it taste like?

A Costco blueberry muffin is soft and tender on the inside with a nice, golden crust. The sweet-tart flavor of the blueberries is balanced perfectly with the buttery sweetness of the muffin. When you take a bite, the texture is light and fluffy but still has a bit of substance to it. As you chew, you can taste notes of vanilla and cinnamon, which provide a hint of warmth to the overall flavor. The crunchy sugar topping adds just the right amount of texture contrast and sweetness.


  • It’s important to take your time when making muffins. Be sure to measure all of the ingredients carefully and incorporate them properly into the batter.
  • If desired, you can substitute frozen blueberries for fresh ones. However, keep in mind that frozen berries tend to release more liquid than their fresh counterparts. To prevent the muffins from becoming soggy, reduce the amount of liquid in the batter if using frozen blueberries.
  • To add a bit of crunch and decoration, sprinkle coarse sugar over the muffins before baking. This will give them a delightful sugary crust as they bake.
How to Make Costco Blueberry Muffin Recipe

Nutrition Information

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What Ingredients Can I Replace or Substitute While Making It?

  • The butter can be replaced with an equal amount of vegetable oil, coconut oil, or a vegan butter alternative.
  • If you want to make the muffins healthier, you can substitute some of the all-purpose flour for whole wheat flour.
  • You can replace the granulated sugar with brown sugar, honey, maple syrup, or agave nectar.
  • For a dairy-free version, you can substitute almond milk or coconut milk for the regular milk.
  • You can also add in other ingredients like nuts, dried fruit, spices, or extracts to give the muffins some extra flavor. Just be sure not to overmix the batter when adding these additional ingredients.

What to serve with a Costco blueberry muffin?

A Costco blueberry muffin is the perfect accompaniment to a variety of dishes. These muffins make an excellent snack or breakfast treat when paired with yogurt or milk. They are also delicious and served alongside a cup of coffee, hot tea, or cocoa as a midday pick-me-up. For dinner, these muffins can be a tasty side dish when served with a vegetable-based entree.

If you’re looking for something a little more decadent, try serving these muffins with clotted cream or lemon curd. The tart sweetness of the cream or curd complements the lightly tart blueberries in these muffins perfectly.

How to store leftover Costco blueberry muffins?

Knowing how to properly store your leftover Costco blueberry muffins is essential for preserving their freshness and flavor. To keep them tasting delicious, wrap each muffin individually in plastic wrap or aluminum foil. Place the wrapped muffins in an airtight container and then store them in the refrigerator for up to five days.

If you’d like to save these muffins for a longer period of time, you can freeze them. Wrap each muffin tightly in plastic wrap then place them into an airtight container or freezer-safe bag. Freeze the muffins for up to three months and thaw in the refrigerator overnight before serving.

How to reheat Costco blueberry muffins?

There are a few different ways to reheat Costco blueberry muffins. The most popular and simplest method is to use the microwave. Wrap the muffin in a damp paper towel and then heat it on medium power for approximately 30 seconds.

If you don’t have access to a microwave, you can also reheat these muffins in the oven or toaster oven. Place the muffin on a baking sheet and warm it in the preheated oven for about five minutes, or until heated through. You can also use a toaster oven if you’re only reheating one or two muffins at a time. Toast the muffins for approximately four minutes, making sure they don’t get too browned.

How to Make Costco Blueberry Muffin Recipe

Costco Blueberry Muffin Recipe

Indulge your taste buds with the heavenly delight of Costco’s blueberry muffins, now easily replicable at home! With a perfect blend of juicy blueberries these jumbo muffins are a treat to relish.
3 from 3 votes
Print Pin Rate
Author: Dr. Leah Alexander
Course: Appetizer
Cuisine: American
Prep Time: 25 minutes
Cook Time: 30 minutes
Rest time: 10 minutes
Total Time: 1 hour 5 minutes
Servings: 4
Calories: 390kcal


  • 3/4 cup fresh blueberries bursting with juicy goodness, adding a vibrant pop of color and a sweet-tart burst of flavor to each bite. The blueberries also offer a pleasant texture and visual appeal to the finished baked goods.
  • 1/4 teaspoon salt enhancing the flavors of the other ingredients and balancing the sweetness, creating a well-rounded and harmonious taste.
  • 1 cup all-purpose flour the versatile and essential ingredient that forms the base of the batter, providing structure and a tender crumb to the final baked goods.
  • 1/2 teaspoon pure vanilla extract imparting a fragrant and aromatic note, enhancing the flavors of the other ingredients and adding a touch of sweetness.
  • 1/4 cup unsalted butter melted, infusing the batter with its rich and creamy goodness, adding moisture and a luscious buttery flavor that enhances the overall taste experience.
  • 1 large egg providing structure and binding the ingredients together, resulting in a tender and moist crumb.
  • 1/2 cup buttermilk or whole milk adding moisture and richness to the batter, contributing to a soft and tender texture in the final baked goods.
  • 1/2 cup granulated sugar adding a delightful sweetness that caramelizes beautifully during baking, creating a golden and irresistible crust.
  • 1 teaspoon baking powder acting as a leavening agent, causing the batter to rise and ensuring a light and fluffy texture in the finished product.


  • Preheat your oven to 375°F and line a muffin tin with liners.
  • Mix the flour, sugar, baking powder, and salt in a large bowl.
  • Take another bowl, and whisk together milk, eggs, melted butter, and vanilla extract.
  • Blend the wet mixture into the dry ingredients well and then add the blueberries.
  • Fill each muffin cup about 2/3 full with the batter.
  • Bake for 25-30 minutes or until a toothpick comes out clean when inserted into a muffin.
  • Let the muffins cool in the tin for 5 minutes before transferring them to a rack.


  • It’s important to take your time when making muffins. Be sure to measure all of the ingredients carefully and incorporate them properly into the batter.
  • If desired, you can substitute frozen blueberries for fresh ones. However, keep in mind that frozen berries tend to release more liquid than their fresh counterparts. To prevent the muffins from becoming soggy, reduce the amount of liquid in the batter if using frozen blueberries.
  • To add a bit of crunch and decoration, sprinkle coarse sugar over the muffins before baking. This will give them a delightful sugary crust as they bake.
Keyword: Costco Blueberry Muffin Recipe


Q: Should the muffin batter be stirred vigorously to mix the ingredients?

A: No, it is important not to overmix the batter when making muffins. Stirring too much can lead to tough and dense muffins. It’s best to gently fold in the wet and dry ingredients until just combined.

Q: Does this recipe work with other types of berries?

A: Yes, this recipe can easily be adapted for other types of berries. You can use fresh or frozen strawberries, blackberries, raspberries, or even a combination of all four. Just be sure to adjust the amount of sugar and liquid in the batter if you are using frozen fruit.

Q: How can I make these muffins more moist and flavorful?

A: Adding some yogurt or sour cream to the batter is a great way to make the muffins more moist and flavorful. You can also add in a teaspoon of your favorite extracts, like almond or coconut, for extra flavor. Lastly, you can sprinkle chopped nuts over the top of each muffin before baking to add some crunch.

Wrapping Up

Costco blueberry muffins are a delicious and easy-to-make treat that will bring joy to any occasion. Whether you’re enjoying these muffins for breakfast, as a snack, or even for dessert, their sweet-tart flavor and tender texture are sure to be a hit with everyone. Plus, with the added bonus of being able to customize them to your own taste, you’ll be sure to make the perfect muffin every time. So why not give them a try today? You won’t regret it!

Please share your feedback with us on how this recipe turned out for you and if you have any other tips or tricks! We would love to hear from you.

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Author Profile

Dr. Leah Alexander, M.D., is a board-certified Pediatrician in New Jersey and has been working at Elizabeth Pediatric Group of New Jersey since 2000.
She also has a passion for culinary arts that extends beyond the medical realm. After completing culinary school at the French Culinary Institute, she started Global Palate, LLC, a catering firm, in 2007. She ran her own six-year-old catering company and served small group parties as an owner and executive chef.

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