MAKES ABOUT 1½ CUPS
½ cup (1 stick) unsalted butter, softened
⅓ cup confectioners’ sugar
1 (7½-ounce) jar marshmallow creme
1 tablespoon whole milk
In a large bowl using a handheld mixer, beat the butter on medium speed until creamy. Add the confectioners’ sugar, marshmallow creme, and milk and beat on medium to medium-high speed until frosting is smooth, creamy, and a nice spreading consistency.