INGREDIENTS
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1 19.9-ounce box Betty Crocker dark chocolate fudge brownie mix
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1/4 cup water
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1/2 cup vegetable oil
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2 eggs
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8 tablespoons unsalted butter, softened
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2 cups powdered sugar
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2 tablespoons creme de menthe
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green food coloring (optional)
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1 1/2 cups dark or semi-sweet chocolate chips
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4 tablespoons unsalted butter, softened
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1/2 teaspoon peppermint extract