Sarah's Italian Meringue Buttercream

Ingredients (5)

• + 1 cup pasteurized liquid egg whites (such as Crystal Farms® All Whites®) add to pantry
• ✓ 1 ¼ cups white sugar, divided
• ✓ ¼ cup cold water
• + 2 cups unsalted butter, cut into 1-tablespoon chunks add to pantry
• + 1 tablespoon pure vanilla extract add to pantry