|
Using a mixer fitted with a paddle attachment, beat the butter and sugar in a large bowl on medium speed about 2 minutes, until light and fluffy. Scrape down the sides of the bowl. Add the egg whites and vanilla and beat on medium speed for about 1 minute. Combine the flour, baking soda, salt, and baking powder in a medium bowl. Add about one-third of the flour mixture to the batter and beat on medium speed until incorporated. Add about half of the buttermilk and beat on medium speed until incorporated. Continue adding dry and wet ingredients alternately, scraping the bowl down and beating until incorporated after each addition. End with the dry ingredients. The batter will be thick and glossy.
|
