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In a large saucepan melt butter over low heat. Add marshmallows and stir until completely melted. Remove from heat.
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Add Rice Krispie's cereal. Stir until coated.
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Using buttered spatula, or wax paper, evenly press mixture into 13x9x2 inch pan coated with cooking spray. (I also spray a baggie that I put on my hand so that I can pat the rice krispies down in the pan)
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Cut out with a heart shaped cookie cutter.
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Decorate with pink frosting, sprinkles, candy, etc.