INGREDIENTS
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1/2 cup unsalted butter, at room temperature
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1/2 cup sugar
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1 egg
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1 tsp vanilla extract
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5 oz (1 cup) flour
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1/4 cup sugar
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1/4 cup unsalted butter (4 tbsp)
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14 oz can sweetened condensed milk
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12 oz bag semisweet chocolate chips
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2 tbsp vegetable oil
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sea salt for sprinkling, if desired