INGREDIENTS
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1 cup plus 2 tablespoons old-fashioned oats
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1 cup (8 ounces) unsalted butter, at room temperature
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1/2 cup cane sugar
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1/2 cup packed dark brown sugar
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1/2 cup packed light brown sugar
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1 extra-large egg, at room temperature
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1 teaspoon vanilla extract
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1/2 cup cake flour
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1/2 cup all-purpose flour
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1 1/2 teaspoons baking soda
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1 teaspoon kosher salt
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1 teaspoon sea salt flakes
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1 cup butterscotch chips