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Bottom Layer: In saucepan, combine 1/2 cup butter and cocoa powder.
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Heat & stir until well blended.
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Remove from heat & add 1/2 cup of the powdered sugar, egg, and vanilla.
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Stir in graham cracker crumbs.
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Press into bottom of ungreased 9X13 pan. Bake at 350 degrees for 20-25 minutes. Cool completely.
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Middle Layer: Melt 1/2 cup butter.
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In small bowl, combine melted butter and creme de menthe.
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Using mixer at low speed, beat in remaining powdered sugar until smooth.
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Spread over bottom layer.
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Chill 1/2 hour.
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Top Layer: Melt 1/4 cup butter and chocolate chips over low heat.
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Spread over mint layer.
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Chill 1/2 hour.
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Cut into small pieces, store in refrigerator.