Butter Icing for Sugar Cookies

1 ½ cups confectioners sugar

3 tablespoons butter, softened

1 tablespoon vanilla extract

1 tablespoon milk

3 drops red food coloring

1 (2.25 ounce) jar red decorator sugar

Combine confectioners sugar butter, vanilla and milk, beating until creamy. Thin with a few more drops of milk (if necessary) to reach desired spreading consistency. Stir in optional food coloring. Spread frosting over cooled cookies and decorate with colored sugar, if desired.