-
Preheat oven to 325°.
-
Coat 2 8-inch cake pans with cooking spray and line with parchment paper.
-
Sift together the flours, baking powder and salt.
-
Cream the butter and sugars together in a large mixing bowl until light and fluffy.
-
Add vanilla and the egg whites, scraping down the sides of mixing bowl.
-
Mix again until fluffy.
-
Add the sifted flour mixture in three batches, alternating with three batches of milk, and ending the additions with flour.
-
Mix each addition just until combined; do not overmix or the cake will be dry.
-
Pour batter into prepared pans.
-
Bake for 30- 35 minutes, or until cake tests done.
-
Let the cakes cool completely in the pans on wire racks.
-
Wrap and refrigerate (cake still in pan) until ready to decorate.