INGREDIENTS
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Ingredients
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1
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cup butter, softened
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2/3
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cup sugar
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1
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egg
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2
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teaspoons vanilla
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2 1/2
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cups all-purpose flour
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2
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tablespoons unsweetened cocoa powder or 1 ounce semisweet chocolate, melted and cooled
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1
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teaspoon mint extract
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Green food coloring
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2
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ounces dark chocolate, coarsely chopped (optional)