#1 Line 2 large, rimmed pans with cooking parchment paper. Divide popcorn, granola bar pieces and marshmallows between pans. Spread evenly #2 In small microwavable bowl, microwave chocolate chips uncovered on High 1 minute stir. Heat another 15 to 30 seconds on High stir until smooth and fully melted. Spoon and drizzle melted chocolate evenly over popcorn mixture #3 Refrigerate mixture on pans 20 to 30 minutes or until chocolate is set. Break into pieces toss to combine.