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Pound the breasts until 1/4" thick. Dredge in the flour mixture.
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Heat the oil over medium heat. Add the chicken and saute about 7 minutes, turning once. Remove and keep warm.
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Add the butter to the fry pan and increase the heat to high. Add the onion and mushrooms. Saute about 5 minutes. Reduce the heat to low. Add the cream, parsley, mustard and lemon juice. Bring to a boil stirring constantly. Add juices from chicken into cream mixture.
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Pour the sauce over the chicken and serve.