White cake with Buttercream Frosting

Excellent cake and Frosting. Easy Too!

For the Cake:
2-1/2 cup sifted cake flour
1-1/2 cups sugar
3-1/2 tsp. baking powder
1/2 cup butter, softened
1/2 tsp. salt
3/4 cup milk
1-1/2 tsp. vanilla
4 egg whites, at room temperature
PREPARATION:
Preheat oven to 350 degrees F. Grease and flour two 9" round layer cake pans and line the bottoms with waxed paper; set aside. Sift flour, sugar, and baking powder into a large mixer bowl. Add butter, milk and vanilla.
Beat on slow speed until blended. Then beat on medium speed for 2 minutes, occasionally scraping down the sides of the bowl. Add unbeaten egg whites (yes, UNbeaten - that's the trick), and beat two minutes longer at medium speed.
Pour batter into prepared pans and bake at 350 degrees for 20 to 30 minutes or until cake is light golden brown and is beginning to pull away from the sides of the pan. Cool 15 minutes in pans, then carefully remove layers from pans and cool completely on wire rack.

Fill and frost with Buttercream Frosting
1 cup butter, softened
6-7 cups powdered or confectioner's sugar
1/4 tsp. salt
6-9 Tbsp. milk
2 tsp. vanilla
PREPARATION:
In large bowl, cream butter until very fluffy. Add part of the sugar and salt and beat again. Continue adding sugar and milk in small batches, alternately, beating until very fluffy. Stir in vanilla. Fill and frost cake.