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Step 2: Cream the Butter and Sugar
In the bowl of a stand mixer fitted with the paddle attachment, cream the butter for 10 minutes until pale and fluffy. Scrape down the sides as needed. Mix in the egg whites and continue mixing on low for three minutes.
Step 3: Add the Dry Ingredients
In a small bowl, whisk together the cake flour, baking soda, baking powder, and salt. Gradually mix the dry ingredients into the wet ingredients, alternating with the buttermilk, starting and ending with the flour mixture.
Step 5: Make the Frosting
In a mixing bowl, cream the butter and cream cheese. Gradually add 2 cups of powdered sugar and the milk. Mix in the remaining powdered sugar until the frosting is smooth.
Step 6: Assemble and Frost the Cake
Place one cooled cake layer on a cake stand. Spread cream cheese frosting on top, then place the second layer on top. Frost the entire cake using an offset spatula or piping bag.
Keep the Bright White Color with Egg Whites
To ensure the cake comes out snow white, use only egg whites. Egg yolks add richness and color, so separating them helps maintain the cake’s white appearance.