Royal Icing

Ingredients:

3 tbsp meringue powder
4 cups powdered sugar
6–8 tbsp water
1/2 tsp vanilla extract

Method:

1. Combine meringue powder and powdered sugar in the bowl of a mixer.
2. Add 6-7 tablespoons of water and mix with whisk attachment at medium speed for about 7-10 minutes, or until icing looses it’s sheen. Begin with 6 tablespoons and add up to an addition tablespoon if needed to get the icing smooth for mixing.
3. Once icing is ready, add additional water to get the right consistency for piping and the vanilla extract. See notes and video above for guidance on consistency, coloring and piping.

Notes:

Once icing is ready, cover with a damp cloth to keep it from drying out. Icing can be stored in an airtight container for 1-2 weeks. Stir again before using.

Source