Peanut butter rice crispie treats

Fair warning: The marshmallow, peanut butter mixture is really hard to stir. Share the responsibility with someone else, so you won't have sore arms

1 cup chunky peanut butter
2 bags of marshmallows
8-10 cups rice crispies
melted butter or cooking spray

Melt marshmallows and peanut butter together in a large pot. When the mixture is completely melted, stir in rice crispies. Spread mixture, while still warm, onto a large bar stone/pan. Cut into squares and store in an airtight container.