I made this sometimes 3 times a week in college. It was sweet, easy, cheap, and only used two dishes: a spoon & a mug. Doable!
3 marshmallows OR 15 mini marshmallows
1 c crisp rice cereal
1 tbsp peanut butter
Spoon peanut butter into a large mug and microwave on high for 20 seconds. Load remaining ingredients on top of peanut butter and microwave 20-30 more seconds or until marshmallows poof to the point of explosion. Stir together and eat immediately.