1teaspoonvanilla extractpreferably clear vanilla for white icing
4cupsconfectioners’ sugar
Gel food coloringoptional
Wateras needed for flood consistency
Instructions
Add the pasteurized egg whites and vanilla to the bowl of a stand mixer fitted with the whisk attachment. Beat on medium speed until frothy.
With the mixer on low, gradually add the confectioners’ sugar. Mix until the sugar is fully incorporated.
Increase the mixer speed to medium-high and beat for 5 to 7 minutes, until the icing is glossy and holds stiff peaks.
Divide the icing into bowls and tint with gel food coloring, if desired.
For outline icing, use as is. For flood icing, stir in water a few drops at a time until a ribbon of icing disappears back into the bowl in 10 to 15 seconds.
Transfer icing to piping bags or decorating bottles and decorate cooled cookies.
Video
Notes
Keep unused icing covered with plastic wrap pressed directly against the surface so it does not dry out.
Store leftover icing in an airtight container in the refrigerator for up to 3 days. Bring to room temperature, then stir or rewhip before using.
Freeze tightly sealed leftover icing for up to 2 months. Thaw overnight in the refrigerator before using.
For bright white icing, use clear vanilla extract and gel food coloring.
For an egg-free variation, combine 4 cups powdered sugar, 3 tablespoons aquafaba, and 1/2 teaspoon vanilla or almond extract. Beat until glossy and smooth