Coffeecake, Vanilla

Ingredients

• 1-1/2 sticks butter
• 1-1/2 cups sugar
• 2 cups flour
• 2 tsp. baking powder
• 1/4 tsp. salt
• 6 (1/2 cup) egg whites
• 3/4 cup milk or soy milk
• 2 tsp. vanilla