INGREDIENTS
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1 tablespoon oil, plus
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1 teaspoon oil, divided
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10 ounces boneless skinless chicken breasts (cut into 1/2-inch strips)
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2 cups mushrooms (sliced)
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1 cup onion (sliced)
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1 cup chicken broth (low sodium)
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2 teaspoons flour
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3 tablespoons fat free sour cream
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1 teaspoon red wine vinegar
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1 teaspoon dijon-style mustard
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1/4 teaspoon pepper