Add baking powder and sugar to the shifted cake flour and sift together 3 times.

Cut butter into pieces and blend with flour using pastry blender.

Add milk and water mixture, sugar and flavoring.

Beat until smooth.

Fold in egg whites.

Preheat oven to 375°F.

Bake in greased and floured 9x13 inch pan for 25-30 minutes, or 2 round cake pans for 20-25 minutes.