Line a 9x9-inch baking dish with parchment paper, then melt butter and marshmallows in a large saucepan over medium-low heat.
Mix together the rice cereal, crushed graham crackers, and chocolate chips in a large bowl.
Add melted marshmallows to the cereal mixture, mix well.
Transfer treats mixture to your lined baking dish and let sit at room temperature for 1 hour before slicing.
Notes
Optional Step: Top finished treats off with an extra sprinkling of crushed graham crackers, marshmallows, and chocolate. Then place it in the oven on broil for 1 minute or until marshmallows are golden brown and toasty!