Unfortunately no icing is invincible when stacked with other cookies, but Royal Icing is one that sets up well. Here is the recipe, good luck!
Prep: 15 min.
Makes: about 5 cups
This icing offers the perfect consistency for piping. For a thinner consistency, add more water 1 tablespoon at a time.
1 16-ounce package powdered sugar (3 1/4 cups)
3 tablespoons meringue powder (available among cake-decorating supplies at crafts stores)
1/2 teaspoon cream of tartar
1/2 cup warm water
1 teaspoon vanilla
1. In a large mixing bowl, combine powdered sugar, meringue powder, and cream of tartar. Add the water and vanilla. Beat with an electric mixer on low speed until combined; beat on high speed for 7 to 10 minutes or until mixture is very stiff. Cover bowl with a damp paper towel and plastic wrap; refrigerate for up to 2 days.