Fluffy White Buttercream Frosting

Name: Fluffy White Buttercream Frosting
Prep time: 15 min
Total time: 15 min
Ingredients: 3/4 cup (149g) granulated sugar; 1/4 teaspoon salt (if you use unsalted butter); 1/2 cup (113g) boiling water; 1/4 cup (28g) meringue powder; 1 tablespoon (14g) King Arthur Pure Vanilla Extract; 4 cups (454g) sifted confectioners' sugar or glazing sugar; 32 tablespoons (454g or 1 pound) unsalted butter, softened or 2 cups (369g) vegetable shortening, or a combination of both.*