INGREDIENTS
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3/4 cup butter, softened
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1 1/4 cup dark brown sugar, plus more for garnish
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1 egg
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1 teaspoon vanilla extract
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2 cups all-purpose flour
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2 teaspoons baking soda
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1 teaspoon cornstarch
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1/2 teaspoon salt
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1/4 teaspoons cinnamon
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1 1/2 cups butterscotch chips