No doubt about it, your kids will love this snack! Who can say no to peanut butter, chocolate, and marshmallows? It serves quite a lot, so be prepared to share or save some.
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In a large saucepan, combine the marshmallows, butter, and peanut butter. Cook and stir over medium-low heat until melted.
Remove from the heat. Stir in the cereal and M&M's.
Pat into a 13-by-9-inch pan coated with cooking spray. Cool. Cut into bars.