INGREDIENTS
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1/2 cup butter
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1 1/4 cup dark brown sugar
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1/2 cup sugar
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1 egg plus 1 egg yolk
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1 teaspoon vanilla extract
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1 cup creamy peanut butter
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1/4 cup vegetable oil
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1/4 cup plain nonfat Greek yogurt (sour cream also works)
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2 3/4 cups all purpose flour
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1/4 salt
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1 teaspoon baking soda