1 stick unsalted butter, at room temperature, plus more for the pans
2 cups cake flour, plus more for dusting
1 tablespoon baking powder
1/2 teaspoon salt
1/2 cup blanched almonds
5 large egg whites
1 cup whole milk
2 teaspoons vanilla extract
1 1/2 teaspoons almond extract
1 1/2 cups granulated sugar
White nonpareils or sprinkles, for topping (optional)
8 ounces white chocolate, coarsely chopped
2 8-ounce packages cream cheese, at room temperature
1 1/2 sticks (12 tablespoons) unsalted butter, at room temperature
1 cup confectioners' sugar