Fluffy Vanilla Cake Recipe

Today I wanted to try a new recipe, I've been trying to get a fluffy white cake that is moist and good! I  found it. Here it is below!! I've altered the original to make it better. Enjoy

Fluffy White Cake

Ingredients

2 1/4 cups sifted cake flour                                                    1/2 cup unsalted butter
1 1/2 cups sugar                                                                    1 cup milk (whole milk)
3 1/2 teaspoons baking powder                                             1 teaspoon vanilla extract
1 teaspoon salt                                                                      4 egg whites

1. Preheat oven to 350 . F. Grease a 9x13 inch pan or 2 9 inch rounds.
2. Sift cake flour, baking powder and salt in a separate bowl. (whisk together to incorporate air) set aside.
3. Cream together butter and sugar in a separate bowl, add vanilla and beat in the milk.
4. Slowly combine the flour mixture into the butter mixture just to moisten. Set aside
5. Beat the egg whites in a metal bowl until they form stiff peaks. Fold 1/3 of the egg whites into the batter, then quickly add the remainder, Pour batter into pan(s). Bake 9x13 inch cake for 25-30 minutes or until toothpick comes out clean. If using 9 inch cake pans bake for 20-30 minutes until they are done.
6. Cool completely on a rack.