Chocolate Waffles

Name: Chocolate Waffles
Ingredients: 1.5 cups all-purpose flour; 0.5 cup white sugar; 3 tablespoons unsweetened cocoa powder; 3 teaspoons baking powder; 0.5 teaspoon salt; 1 cup milk; 2 large eggs; 4 tablespoons butter, melted; 1 tablespoon butter, softened; 0.75 cup confectioners' sugar; 0.5 teaspoon vanilla extract; 1 teaspoon milk; nonstick cooking spray