Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking powder, and salt.
Cream Butter: In a separate bowl, beat the softened butter until creamy. Gradually add the dry ingredients, mixing until combined.
Add Wet Ingredients: In another bowl, whisk together the egg whites, milk, and vanilla extract. Gradually add this mixture to the butter and flour mixture, mixing until smooth.
Bake the Cake: Divide the batter evenly between the prepared pans. Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean. Allow the cakes to cool in the pans for 10 minutes, then transfer to wire racks to cool completely.
Prepare the Frosting: In a large bowl, beat the softened butter until smooth. Gradually add the powdered sugar, cream, and vanilla extract, mixing until fluffy and well combined.
Assemble the Cake: Once the cakes are completely cool, place one layer on a serving plate. Spread a layer of frosting on top, then place the second layer on top and frost the top and sides of the cake.
Serve: Slice and enjoy your delicious Simple White Cake!
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