Cookie Frosting That Gets Hard

Nothing like having your sugar cookies all stuck together because the icing never firmed up.  Take a few spoonfuls at a time of canned frosting (not whipped) and put in the microwave for about 10 seconds, until it just starts to melt.  Stir and quickly frost cookies.  You can add a drop of food coloring if you want.  Set cookies aside for about an hour and they will be good to travel or pack and mail.  Only do a few spoonfuls at a time and apply thinly on the cookies.  Easy and foolproof - yippee.