#1. Heat oven to 350°F. Grease bottom of 13x9-inch pan with shortening or cooking spray. #2. Make brownie batter as directed on box. Spread in pan. #3. Bake 22 to 25 minutes or until toothpick inserted 2 inches from side of pan comes out almost clean. Cool completely on cooling rack, about 1 hour. #4. Using fork, break apart brownies into small pieces. Place brownies in large bowl. Stir in chocolate syrup until brownies are moistened. Set aside. #5. Spray another 13x9-inch pan with cooking spray. #6. In 6-quart Dutch oven, melt butter over medium-low heat. Add marshmallows stir until completely melted and mixture is well blended, 2 to 3 minutes. Remove from heat. Stir in peanut butter until melted. Add cereal mix well. Using a spatula sprayed with cooking spray, press half of cereal mixture evenly in bottom of pan. #7. Top cereal layer with reserved brownie mixture press to make a lightly packed brownie layer. Spoon remaining cereal mixture over top, and spread to cover brownie layer, pressing firmly for an even top. Cool 15 minutes. #8. In small microwavable bowl, microwave chocolate chips and 1/2 teaspoon oil uncovered on High 30 to 60 seconds. Stir until smooth. Drizzle over bars. Refrigerate about 40 minutes or until chocolate is set. Cut into 6 rows by 4 rows.