01 -
Preheat oven to 350°F. Grease and flour two 9-inch cake pans and line bottoms with parchment paper. Set aside.
02 -
In a bowl, combine cake flour with salt and baking powder. Use a whisk to blend everything together thoroughly. Set aside.
03 -
In a large mixing bowl, beat butter with sugar for 2 minutes, scraping down the sides of the bowl as needed. Add in eggs, egg whites, and vanilla extract. Beat for 2 more minutes until light and fluffy.
04 -
Alternating additions of the dry ingredients with the buttermilk, slowly add each (about 3 additions of each). After the final addition of buttermilk, beat for 1-2 minutes until the batter is smooth and fluffy.
05 -
Pour the batter evenly into prepared cake pans. Bake for 25-28 minutes, or until a toothpick inserted into the center comes out clean.
06 -
Allow cakes to cool in pans for 5 minutes, then carefully remove from pans and cool completely on a wire rack before frosting.