Classic White Cake

12 tablespoons (1 1/2 sticks) unsalted butter, softened
1 1/2 cups sugar
2 cups all purpose flour
2 teaspoons baking powder
1/4 teaspoon salt
6 large egg whites (3/4 cup)
3/4 cup milk
2 teaspoons vanilla extract

1 1/2 cups Andes Peppermint Crunch Baking Chips
pink food coloring

Chocolate Cake:
1 3/4 cups all purpose flour
2 cups sugar
3/4 cup unsweetened cocoa
1 1/2 teaspoon baking soda
1 1/2 teaspoons baking powder
1 teaspoon salt
2 eggs
1 cup milk
1/2 cup vegetable oil
1 teaspoon vanilla
1 cup boiling water

Marshmallow Frosting:
4 egg whites
1 ½ cups sugar
½ cup light corn syrup
pinch of salt
2 tsp vanilla
1 tsp peppermint extract
6 drops pink food coloring