INGREDIENTS
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1 1/4 cups unbleached all-purpose flour 1 tsp. baking soda 1/2 tsp. salt 1/2 cup (1 stick) unsalted butter, at room temperature 1/2 cup packed light brown sugar 6 Tbsp. granulated sugar 1 large egg 1 tsp. vanilla extract 4 cups (24-ounces) semisweet