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Combine cookie crumbs and ⅓ cup butter in medium bowl. Press onto bottom of ungreased 9x9 inch baking pan and refrigerate until firm.
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Combine powdered sugar, remaining ⅓ cup butter, milk, and creme de menthe in mixing bowl.
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Beat at medium speed until light and fluffy (should resemble frosting.) Spread over crust.
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Drizzle melted chocolate over crust and refrigerate until firm, about 2 hours.
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Cut into bars; store in refrigerator.
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(adapted from The Great American Cookie Cookbook's Citrus Cream Bars recipe)