INGREDIENTS
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1 cup butter, softened
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1/2 cup sugar
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1/8 teaspoon salt
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2 cups all-purpose flour
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1/3 cup miniature semisweet chocolate pieces
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1/2 teaspoon mint extract
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Green food coloring
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1 teaspoon vanilla
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1 cup semisweet chocolate pieces (optional)
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1/4 teaspoon shortening (optional)