Place marshmallows and butter into a large heat proof bowl. Microwave until melted and puffed up, about 1 minute 30 seconds (will be different in all microwaves, watch through the glass.) Remove bowl and add Hershey’s Simply 5 Syrup and cereal. Stir to combine then gently stir in chocolate chops. Transfer to a parchment lined 9 x 13 inch baking dish, pressing evenly. Let cool completely before cutting into squares. Serve room temperature.