INGREDIENTS
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1 c. butter, divided
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1/2 c. old-fashioned oatmeal
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3/4 c. packed light brown sugar
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3/4 c. granulated sugar
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1 tsp. salt
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1 T vanilla
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1/2 tsp. white vinegar
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2 eggs
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1 1/2 tsp. baking soda
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2 c. unbleached, all-purpose flour
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1 c. chopped walnuts or pecans
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6 oz. semi-sweet chocolate chips
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3-6 oz. dark chocolate chips or small chunks