Ingredients

　　1/2 cup (1 stick) unsalted butter, room temperature

　　8 ounces cream cheese, room temperature

　　1 cup packed light-brown sugar

　　With an electric mixer on medium-high speed, beat butter, cream cheese, and brown sugar until smooth. Use immediately, or refrigerate up to 3 days in an airtight container. Before using, bring to room temperature, and beat on low speed until smooth.

　　Martha Stewart's Cupcakes