In a large bowl, combine muffin mix, milk and egg; stir just until moistened. Fold in marshmallows and chips., Lightly grease a griddle; heat over medium heat. Pour batter by 1/4 cupfuls onto griddle. Cook until bubbles on top begin to pop and bottoms are golden brown. Turn; cook until second side is golden brown., Meanwhile, microwave maple syrup and peanut butter in 10- to 20-second intervals until heated through. Serve with pancakes.