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Butter the bottom of a 13" x 9" pan.
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Melt the butter and marshmallows over low heat.
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When melted, remove from heat, and stir in rice krispies.
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Spread the rice krispies into the prepared pan.
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While the rice krispies are still wet, sprinkle with colored sugar (if desired for Valentine's Day).
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When the rice krispies have cooled, you can cut the rice krispies into squares or use a cookie cutter to cut them into shapes.