1 cup whole milk
4 large egg whites, at room temperature
2 1/4 teaspoons pure vanilla extract
3 cups sifted cake flour
1 1/2 cups sugar
4 teaspoons baking powder
3/4 teaspoon salt
1 1/2 sticks unsalted butter, cut into tablespoons, softened
3/4 cup heavy cream
Icing
3 cups sugar
3 tablespoons light corn syrup
1 1/2 cups whole milk
1 stick unsalted butter, softened
1 teaspoon pure vanilla extract
1/2 cup heavy cream