To thicken frosting without adding powdered sugar, make the recipe as directed, and add meringue powder to thicken it. Thickening frosting with meringue powder takes only a couple minutes and requires 1.5 tablespoons of meringue powder, 3 tablespoons of warm water and 2 cups of powdered sugar to make the initial frosting. Meringue powder is a baking enhancer made of sugar and egg white solids and is available at specialty stores.
- Measure the ingredients
Use measuring spoons to accurately measure the powdered sugar and meringue powder in a mixing bowl. Mix the powdered sugar and meringue powder together.
- Mix in the water
Use a mixer at slow speed to slowly mix the warm water with the powdered sugar and meringue powder in the bowl.
- Beat the frosting
Switch the mixer to medium speed. Beat the ingredients in the bowl until stiff peaks form, meaning the frosting holds its shape. Scrape the sides with a spatula at regular intervals.
- Thicken with meringue powder
After beating the frosting for 10 minutes, check for stiff peaks. If they have not formed yet, more meringue powder is required. Add 1/8 teaspoon of meringue powder, and mix at medium speed. Repeat this step until stiff peaks form.