INGREDIENTS
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1/2 cup (1 stick) unsalted butter, at room temperature
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1 cup light or dark brown sugar
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1/4 cup granulated sugar
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2 large eggs
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2 teaspoons vanilla extract
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1 1/2 cups all-purpose flour
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1 teaspoon baking soda
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1/2 teaspoon salt
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1/2 teaspoon ground cinnamon
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3 cups old-fashioned rolled oats (not quick cooking)
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Optional add-ins: 1 cup semi-sweet chocolate chips, chopped walnuts, or raisins