(First – melt your unsalted butter and let it cool - this ensures it won’t cook your eggs when you add it!) Preheat your oven to 325℉, and prepare 24 muffin tins with cupcake liners.
Combine flour, baking powder, baking soda, and salt. Whisk to combine and set aside.
In a medium bowl, beat sugar, eggs, vanilla extract, milk and sour cream until well combined. Add the cooled melted butter and whisk again until well combined.
Add flour mixture to the wet ingredients and mix until just combined. Don't overmix. The batter will be fairly thick; this is normal.
Divide the batter evenly between the cupcake liners, filling them about 2/3 full. (I like to use a cookie scoop for this part!) Bake for 16-20 minutes, or until a toothpick inserted in the center comes out mostly clean.
Allow to cool completely before decorating. (This is a great time to make your frosting!)
Cream Cheese Buttercream Frosting
Beat together softened cream cheese and butter; slowly add in powdered sugar alternating with milk and vanilla until frosting reaches desired taste, color, and consistency.
Remove about 1/2 cup frosting and color blue or pink for the cupcake centers.
Once the cupcakes have cooled, you're ready to core them. There are a few ways you can do this....you can buy a cupcake corer, you can try using the rounded end of a large piping tip, or....you can do what I do and cut a cone-shaped core out with a plastic knife. Up to you! (I haven't the foggiest idea why cupcake crumbs don't stick to plastic knives like they do regular knives, but the plastic knife's been working too well for me for years!)
Pipe colored frosting into your cored cupcakes with a small piping bag.
Transfer remaining (white) frosting to a large piping bag fitted with a star tip. Pipe in large swirls onto your cupcakes. Decorate the top of each frosting swirl with a Bumblebee topper.
Done and done! Enjoy!
Video
Notes
(Please note nutrition information is an estimate and may not be exactly accurate.)