INGREDIENTS
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•3/4 cup unsalted butter, softened to room temp
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•1 cup brown sugar
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•1/4 cup granulated sugar
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•1 egg
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•2 teaspoons vanilla extract
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•2 cups all purpose flour
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•2 teaspoons cornstarch
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•1 teaspoon baking soda
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•1/2 teaspoon salt
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•10 ounces crushed Butterfinger Candy Bars, divided