INGREDIENTS
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1/2 cup shortening
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1/2 cup butter
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1 cup packed brown sugar
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1/2 cup granulated sugar
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1/2 teaspoon baking soda
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2 eggs
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1 teaspoon vanilla
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2-1/2 cups all-purpose flour
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1 12-ounce package (2 cups) semisweet chocolate pieces
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1-1/2 cups chopped walnuts, pecans, or hazelnuts (optional)