INGREDIENTS
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1 3/4 cups all-purpose flour 3/4 teaspoon baking soda 1/2 teaspoon salt 1/2 cup (1 stick) unsalted butter, softened 3/4 cup peanut butter 1/2 cup white sugar 1/2 cup packed brown sugar 1 egg 1 teaspoon vanilla extract 8 oz dark chocolate bar, chopped