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Spray a 15x10 glass baking dish with cooking spray. Set aside.
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In a large plastic microwaveable bowl place butter and mini marshmallows, microwave 1 minute, stir, microwave 30 seconds, stir well. If not completely melted microwave 15 seconds more.
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Stir in half rice krispies; mix well. Stir in remaining rice krispies; mix well.
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Pour into baking dish, wet hand with water to press flat into dish.
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Allow to cool completely.
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Invert onto cutting board and give it a giggle to remove treats.
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In a small microwave dish melt red chocolate, place in ziplock baggie, zip closed, snip very small end off of baggies corner.
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In a small microwave safe bowl melt half of white chocolate (work with half of treats at time for marbling) according to package directions.
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Evenly spread on half of rice krispie treats, place pea sizes dot of red chocolate on white chocolate and using a toothpick pull the ends of dots for a marbled effect. Work quickly so it won't dry. Repeat on second half of rice krispie treats.
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Allow to cool, then cut with heart shaped cookie cutter, if cutter is too thin to cut through completely, finish cutting with a knife.