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The ingredients:
1/2 cup unsalted butter, room temperature
1 package (8-ounces) cream cheese, room temperature
1 cup packed light-brown sugar
Directions:
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. Makes 2-1/2 cups.
Enjoy!
From Martha Stewart's Cupcakes cookbook.