1Heat oven to 350°F. Line bottom and sides of 13x9-inch pan with foil, leaving foil overhanging on 2 opposite sides of pan. Spray foil with cooking spray. Bake and cool brownie mix as directed on box for 13x9-inch pan.
2Place brownies in freezer 30 minutes. Remove brownies from pan, using foil to lift; peel foil from sides of brownies. Cut into 24 rectangular bars, 6 rows lengthwise by 4 rows across, each about 1 1/2 by 3 1/4 inches. Gently insert stick into end of each bar, foil from bars. Place on cookie sheet; freeze 30 minutes.
3In microwavable bowl, microwave candy coating uncovered on High about 1 minute or until smooth when stirred. Stir in food color. Spread on brownies. Insert 2 candies into sides of each brownie to look like ears. Place on waxed paper or foil to dry.
4To decorate, spoon frosting into small resealable food-storage plastic bag; seal bag. Cut small hole in bottom corner of bag. Squeeze bag to pipe frosting on top of each brownie to look like hair. Draw eyebrows, eyes and zigzag mouth to look like Frankenstein face.