Make your royal icing by hand mixing 3/4 c. warm water and 5T. meringue powder in your mixing bowl for 30 seconds.
Add 1 tsp. cream of tartar and mix for another 30 seconds.
Add 2.25 lbs of powdered sugar and mix with the paddle attachment on slow speed for 10 to 15 minutes or until the icing is thick and glossy.
Add 1 tsp. vanilla and mix another 30 seconds
Separate out about 3 cups of icing into another small bowl.
Thin the icing, a few drops of water at a time until when you run a knife through it, it takes about 10 seconds for the mark to disappear.
Add the only slightly thinned royal icing to your piping bag and pipe an outline on the cookies.
Add about 10 more drops of water to the icing in the small bowl and fill another piping bag.
Use this icing to “flood” your cookies. (Tap them gently so the frosting settles.)
Use gel icing coloring to create different colors to pipe your designs with. (For this icing, I used a consistency that was about the same as the outlines.)
Pipe away! (You can use a glass with a wet paper towel in the bottom to hold the bags when you aren’t using them. You can also cover your large bowl of royal icing with a piece of plastic wrap to keep it from drying out while you work.)
Notes
P.S. – How cute is the cookie sheet I used? I got it for $1 at St. Vincent de Paul. What a find!