I hit send before I got to the icing
I don't usually use icing as my kids love to decorate with sprinkles, but I do have this recipe for Ornamental Icing, I'm not sure how it differs from Royal Icing but I think its thicker for a smooth look on the cookie
Makes about 3 cups
1 pkg. (16oz) confectioners sugar
3 T. meringue powder
1/3 c. warm water
assorted food colorings (optional)
1. In bowl, with mixer at med. speed, beat sugar, meringue powder, and water until blended and mixture is stiff so that a knife drawn thru it leaves a clean-cut path, about 5 min.
2. If you like, tint frosting with food coloring as desired. Keep covered with plastic wrap to prevent drying out. With small metal spatula, artists' paintbruses or decorating bags, decorate cookies. You may need to thin frosting with a little warm water to obtain the right spreading or piping consistency.