Chocolate Coal Lumps

Line 13x9-inch pan with foil. Spray with cooking spray.

In 4-quart microwavable bowl, microwave butter uncovered on High about 1 minute or until melted. Add marshmallows; toss to coat. Microwave about 2 minutes, stirring after each minute, until marshmallows are completely melted and mixture is well blended. Add cereal; mix well.

Spoon cereal mixture into pan. Spray hands with cooking spray, and press mixture firmly in pan. Cover with waxed paper; press second 13x9-inch pan on top to compress bars. Remove pan and paper. Cool completely, about 1 hour. Remove bars from pan; peel off foil. Using sharp knife, cut bars into 8 rows by 6 rows to make 48 squares. Line cookie sheet with waxed paper.

In 1-quart microwavable bowl, microwave 12 oz of the chocolate and 1 tablespoon of the shortening uncovered on High 1 minute 30 seconds; stir. Continue microwaving and stirring in 15-second intervals until melted and smooth. Using 2 forks, dip and roll each cereal square in coating. Place on cookie sheet. Repeat twice to use up chocolate, shortening and squares.

Sprinkle coated squares with black sugar and/or sprinkles. Place in freezer 15 minutes or refrigerator 30 minutes until chocolate is set. Store in airtight container or sealed storage bag.