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In a medium saucepan over medium-low heat, melt butter and marshmallows, stirring constantly.
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Once completely melted, remove from heat and add green food coloring (to desired color) and vanilla. Stir until the color is blended.
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Gently stir in cornflakes, making sure to coat the cereal.
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Drop rounded tablespoonfuls onto waxed paper and decorate with red candies. Let stand at least 30 minutes before serving.