INGREDIENTS
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1 cup butter, softened
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1 1/2 cups sugar
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1 1/2 teaspoons baking powder
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1/2 teaspoon salt
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1 egg
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1 teaspoon vanilla
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2 1/2 cups all-purpose flour
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1 tablespoon unsweetened cocoa powder
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1 ounce semisweet chocolate, grated (about 1/3 cup)
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1/2 teaspoon mint extract
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Green paste food coloring