Start by mixing together the sunflower seeds, fresh broccoli florets, white vinegar, crispy bacon, finely chopped red onion, and sour cream in a large bowl.
Enhance the flavors with a dash of black pepper and a pinch of salt. For some sweetness to balance out the tanginess from the vinegar and sour cream, add in sugar while also adding a creamy and slightly salty element with shredded cheddar cheese. Finally, add in mayonnaise for richness and creaminess.
Once all the ingredients are combined, cover the bowl with plastic wrap and refrigerate for at least an hour to allow the flavors to meld together.
When ready to serve, give the salad a quick stir and make any necessary adjustments to the seasonings.