INGREDIENTS
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3/4 cup butter (1 1/2 sticks), at room temperature
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1 1/2 cups brown sugar
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1 large egg
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2 tsp. vanilla
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1 1/2 cups flour
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1/2 tsp. baking soda
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1/2 tsp. baking powder
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scant 1/2 tsp. salt
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2 cup old-fashioned oats
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2 cups cinnamon chips