Classic White Cake - unsalted butter

Method

• Butter two 9-inch diameter by 1 1/2-inch deep layer pans or 1 (13 by 9 by 2-inch) pan.
• Lined bottoms with parchment or waxed paper.
• Set a rack at the middle level of the oven and preheat to 350 degrees.
• In a large mixing bowl, beat butter and sugar for about 5 minutes, until light and fluffy.
• Stir together flour, baking powder and salt.
• Set aside.
• Combine egg whites, milk and vanilla extract.
• Add 1/3 of the flour mixture to butter mixture then add half the milk mixture.
• Continue to alternate beginning and ending with flour mixture.
• Scrape bowl and beater often.
• Pour batter into prepared pan (s) and smooth top with a metal spatula.
• Bake cake (s) about 25 to 30 minutes, or until a toothpick inserted in the center emerges clean.
• Cool in pan on a rack for 5 minutes, then turn out onto a rack, remove paper and let cool completely.