Preparation Steps

• In a large bowl, whisk together the powdered sugar and meringue powder until well combined.
• Gradually add the warm water and vanilla extract (if using) to the dry ingredients.
• Beat with an electric mixer on low speed until just combined, then increase speed to medium-high and beat for 5-7 minutes, or until the icing is stiff and glossy.
• If the icing is too thick, add more warm water, a teaspoon at a time. If it's too thin, add more powdered sugar, a tablespoon at a time.
• Cover the bowl tightly with plastic wrap, pressing the wrap directly onto the surface of the icing to prevent a crust from forming.
• Color the icing with food coloring if desired, and use immediately for decorating.