Ingredients
2½cupscake flour,sifted, spoon and leveled
2tspbaking powder
½tspbaking soda
1tspsalt
¾cupunsalted butter,(1½ sticks), softened to room temperature
1¾cupsgranulated sugar
5large egg whites,room temperature
½cupsour cream,room temperature
1tbsppure vanilla extract
1cupwhole milk,room temperature
1¼cupsunsalted butter,(2½ sticks), softened to room temperature
5cupsconfectioner’s sugar
⅓cupheavy cream
2tsppure vanilla extract
⅛tspsalt
sprinkles,to garnish
Preparation
Preheat the oven to 350 degrees F. Grease and lightly flour two 9-inch cake pans.
Whisk the cake flour, baking powder, baking soda, and salt together. Set aside.
Using a handheld or stand mixer fitted with a whisk attachment, beat the butter at high speed for about 1 minute until smooth and creamy. Add the sugar and beat on high speed for 2 minutes until creamed together. Scrape down the sides and up the bottom of the bowl with a rubber spatula as needed.
Add the egg whites. Beat at high speed for about 2 minutes until combined. Then beat in the sour cream and vanilla extract. Scrape down the sides and up the bottom of the bowl as needed.
With the mixer on low speed, add the dry ingredients until just incorporated. With the mixer still running on low, slowly pour in the milk until combined. Do not overmix.
Pour the batter evenly into cake pans.
Bake for around 24 to 25 minutes or until the cakes are baked through. To test for doneness, insert a toothpick into the center of the cake. If it comes out clean, it is done.
Allow cakes to cool completely in the pans set on a wire rack.
In a large bowl using a hand-held mixer or stand mixer fitted with a whisk or paddle attachment, beat the butter on medium speed for about 2 minutes until creamy.
Add the confectioners’ sugar, cream, vanilla extract, and salt with the mixer running on low. Increase to high speed and beat for 3 full minutes.
Add more confectioners’ sugar if the frosting is too thin, or more cream if the frosting is too thick, or a pinch more of salt if the frosting is way too sweet.
Using a large serrated knife, slice a thin layer off the tops of the cakes to create a flat surface. Discard.
Place 1 cake layer on a cake stand or serving plate. Evenly cover the top with frosting. Top with the 2nd layer and spread the remaining frosting all over the top and sides.
Decorate the top of the cake with sprinkles. Then, slice, serve, enjoy!
