1Spread peanut butter over 1 side of each graham cracker. Place 9 of the graham crackers, peanut butter sides up, in square microwavable dish, 8x8x2 inches. Sprinkle marshmallows evenly over crackers. Sprinkle peanuts and chocolate chips over marshmallows. Top with remaining graham crackers, peanut butter sides down.
2Microwave uncovered on High 1 to 2 minutes or until marshmallows are very soft. Cool at least 15 minutes. Cut each square in half.