Set rack at the middle level in the oven and preheat to 350 degrees.

Butter the bottom of two 9-inch round or one 13 by 9 by 2-inch pan. Line
bottom with parchment or waxed wallpaper.

In a large roll, beat butter and sugar for astir 5 proceedings, until light and
fluffy. Stir together flour, baking powder and saltiness. Set digression. Combine egg
whites, milk and vanilla pull. Adjoin 1/3 of the flour mixture to the
butter mixture then add half the milk assortment. Continue to alternate
beginning and ending with flour assortment. Scape the bowl and beater ofttimes.

Pour the batter into prepared pan(s) and smooth top with metal spatula.
Bake cake(s) roughly 25 to 30 transactions, or until a toothpick inserted in the
center emerges pick.

Cool in pan on rack for 5 transactions, then turn out onto a single-foot, remove paper
and let cool wholly.

Line: For a classic yellow patty- Substitute 3 large egg and 1 yolk for the
egg whites.