Royal Icing

Ingredients

1 egg whites

227 Gm powdered sugar (1.5 C)

1/2 tsp. cream of tartar

Directions

Place all ingredients in a metal mixing bowl. Beat until smooth and standing peaks (about 4-6 minutes).  Keep bowl covered with a damp cloth as you use the frosting (this will help keep the frosting from drying out).

Notes

From: https://tastesbetterfromscratch.com/gingerbread-house/