Waffles: – 1 ½ cups all-purpose flour – ½ cup white sugar – 3 tablespoons unsweetened cocoa powder – 3 teaspoons baking powder – ½ teaspoon salt – 1 cup milk – 2 large egg – 4 tablespoons butter, melted Hard Sauce: – 1 tablespoon butter, softened – ¾ cup confectioners' sugar – ½ teaspoon vanilla extract – 1 teaspoon milk Other: – nonstick cooking spray