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2-1/4 cups all-purpose flour
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1/3 cup cocoa
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1 teaspoon baking soda
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1/2 teaspoon salt
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1 cup (2 sticks) butter or margarine, softened
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3/4 cup granulated sugar
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3/4 cup light brown sugar, packed
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1 teaspoon vanilla extract
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2 eggs
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2 cups (12 ounces) chocolate chips
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1 cup nuts, chopped (optional)
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