HOW TO PREPARE MERINGUE BASE
Use a clean, dry glass or metal bowl free of oil residue.
Combine 1 cup meringue powder with 1/2 cup room-temperature water.
Using a stand mixer with whisk attachment, whip on low speed, then increase to medium-high.
Beat for 8–12 minutes until stiff peaks form. Stop once peaks hold to avoid overbeating.
Royal Icing
Prepare meringue base as directed above.
On low speed, gradually add 16 oz (3 cups) powdered sugar just until incorporated to prevent air bubbles.
Finish mixing by hand. Add water 1 teaspoon at a time until desired consistency is reached.
Meringue Cookies
Prepare meringue base as directed above.
Pipe onto a baking sheet using a pastry bag.
Bake in a preheated 250°F oven for 40–45 minutes, or until firm to the touch.
Turn off oven and allow cookies to cool inside to dry completely.