INGREDIENTS
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2 cups flour
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2/3 cup unsweetened cocoa powder
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1 teaspoon baking soda
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1/4 teaspoon salt
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1 cup (2 sticks) butter, softened
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1 cup granulated sugar
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2/3 cup firmly packed light brown sugar
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2 eggs
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1 teaspoon McCormick® Pure Peppermint Extract
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6 ounces semi-sweet baking chocolate, coarsely chopped
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1 cup chopped walnuts (optional)