Preheat your oven to 350°F (180°C) and prepare two 9-inch cake pans with a light coating of butter and dusting of flour.
In a large mixing bowl, combine the all-purpose flour, baking soda, cocoa, baking powder, sugar, and salt.
In a separate bowl, beat together the eggs, vegetable oil, and vanilla extract until well combined.
Gradually add in the boiling water while continuing to mix.
Slowly pour the wet mixture into the dry ingredients, stirring until a smooth batter forms.
Gently fold in crushed Oreos and colorful gummy bears for an added playful surprise in every bite.
Divide the batter evenly between the prepared cake pans and bake for 35-40 minutes or until a toothpick inserted in the center comes out clean.
Once baked, let the cakes cool in their pans for 10 minutes before transferring them to a wire rack to cool completely.
Assemble and frost your Max and Ruby Cake by placing one layer on a serving plate, adding a generous layer of chocolate buttercream frosting, and topping with the second cake layer.
For an extra touch, decorate your cake with Max and Ruby figurines or printed images before slicing and serving to impress your guests.