4 cups powdered sugar 2.5 Tablespoons meringue powder 6 Tablespoons water 1 teaspoon vanilla extract
Use an electric mixer to beat together all ingredients on low speed
Increase mixer speed to high and beat until mixture is stiff (reaches stiff peaks)
Divide icing as desired and use food coloring to color as desired. This is your outlining icing.
Thin some of the icing with a bit of water until you get the desired texture. This will be your "flooding" icing for filling your cookies.
Use your thicker icing (outlining icing) to outline your cookies and for detail decorations
Use thinner icing (flooding icing) to fill in the cookie decorations.