1 teaspoon butter
1 can (16 ounces) chocolate frosting
2 cups (12 ounces) semisweet chocolate chips
1/2 cup chopped walnuts
1/2 cup miniature marshmallows
Line a 9-in. square pan with foil and grease the foil with butter; set aside. In a microwave, melt frosting and chocolate chips; stir until smooth. Stir in walnuts; cool for 10 minutes. Stir in marshmallows. Transfer to prepared pan.
Cover and refrigerate until firm. Using foil, lift fudge out of pan. Discard foil; cut fudge into 1-in. squares. Store in an airtight container in the refrigerator. Makes about 2 pounds.