1 cup semisweet chocolate pieces ¼ cup butter ½ cup dairy sour cream 2 ¼ cup powdered sugar ½ cup chopped toasted walnuts
Place assembled cookies between sheets of waxed paper in an airtight container; cover. Store in refrigerator for up to 3 days or freeze unfilled cookies for up to 3 months. To serve, thaw cookies, if frozen. Assemble as directed in Step 3.
