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Place chicken breast between two pieces of plastic wrap.
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Pound flat with a meat mallot.
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Spray large frying pan, preheat to medium high heat.
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Brown well on both sides.
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Add onions.
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Cover, reduce heat to medium and cook for approximately 5 minutes.
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Stir in balsamic vinegar, cook for about 1 minute, turn chicken to coat thoroughly.
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Spoon sauce over chicken to serve.