Ingredients
1/2 stick unsalted butter, softened
1 1/2 cups confectioners' sugar
1/4 cup granulated sugar
2 teaspoons pure vanilla extract
1 to 2 tablespoons whole milk, if needed
Preparation
Beat butter with a mixer on medium-high speed until light and fluffy, about 3 minutes. Reduce speed to low, and gradually add sugars, beating until thoroughly combined. Beat in vanilla. If filling is too thick to spread, beat in milk, 1 tablespoon at a time, until spreadable.
