Rainbow Sprinkle Birthday Cake

Step 1

Preheat the oven to 350°F. In a medium bowl, add the dry ingredients: flour, baking powder, baking soda & a pinch of salt. Whisk & set aside.

Step 2

Line a cake pans with parchment paper. Fold one piece of parchment paper into a small triangle. Then, measure half of the width of the cake pan with the tip of the triangle in the center of the pan. Cut the triangle to fit & unfold. Line the bottom of the cake pan with the paper & spray with baking spray. Repeat the step for the second pan.

Step 3

Add the sugar & room temperature butter to the bowl of an electric stand mixer (an electric hand mixer works too). See our tip below on how to quickly soften butter! Mix on medium speed until light & fluffy, about 2 min.

Step 4

Add the eggs to the mixer one at a time, mixing thoroughly after each egg. Add the vanilla extract & mix for 1 min.

Step 5

On low speed, slowly alternate between adding the dry ingredients & the buttermilk in 5 additions (starting & ending with the flour mixture). Mix the batter until everything is just combined, scraping down the sides as needed.

Step 6

Add the sprinkles & mix on low for 30 sec. Remove the bowl from the stand mixer.

Step 7

Pour the batter evenly into the 2 prepared cake pans. Bake for 30 - 35 min or until a knife inserted in the middle comes clean. Leave the cakes in the pan to cool for about 20 min.

Step 8

Remove the cakes from the pans by inverting them onto a large plate or cooling rack. Let them cool for about 1 hour. You can place them in the freezer for 20 min to speed up the process!

Step 9

Add a large dollop of frosting onto the top of one cake. Spread it evenly. Top with the second cake upside-down. Spread the remaining frosting onto the sides & the top of the cake using an offset spatula (a long knife or rubber spatula works too). Decorate the cake to your liking with additional sprinkles & enjoy!