1/2 cup (1 stick) butter, softened
1 3/4 cups sugar
3 eggs
2 teaspoons vanilla extract
2 1/4 cups all-purpose flour
3 1/2 teaspoons baking powder
1 teaspoon salt
1 1/4 cups whole milk
1 cup (2 sticks) unsalted butter, softened
5 cups confectioners’ sugar
1/2 cup unsweetened cocoa powder
1/4 cup to 1/3 cup half-and-half
4 ounces dark chocolate*, melted and cooled
1/4 cup confetti sprinkles