INGREDIENTS
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1/2 cup unsalted butter, melted
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1 cup packed light brown sugar
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1 large egg
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1 teaspoon vanilla extract
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1 cup all-purpose flour, divided
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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1 & 1/2 cups chopped candy bars (about 10-12 miniature candy bars)