FOR THE CUPCAKES: – 3 cups all-purpose flour – 2 1/2 teaspoons baking powder – 1/2 teaspoon salt – 1 cup (2 sticks) unsalted butter, softened – 1 3/4 cups sugar – 2 large egg – 1 1/2 teaspoons vanilla extract – 1 1/2 cups whole milk – Food coloring (red, orange, yellow, green, blue and purple) – Rainbow sprinkle FOR THE FROSTING: – 1 cup (2 sticks) unsalted butter, softened – 2 teaspoons vanilla extract – 2 Tablespoons heavy cream – 3 cups powdered sugar, sifted – Equipment: Cupcake wrapper