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Flatten chicken to 1/2 inch thickness.
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Place in a large resealable plastic bag; add salad dressing.
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Seal bag and turn to coat; refrigerate for 8 hours or overnight.
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Drain and discard marinade.
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Combine flour, Italian seasoning, garlic powder, paprika, and pepper; sprinkle over both sides of chicken.
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In a large nonstick skillet coated with cooking spray, cook chicken in 1 tablespoon oil and butter for 2 minutes on each side or until browned.
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Transfer to a 13 x 9 inch baking dish coated with cooking spray.
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Gradually add broth and wine to skillet, stirring to loosen browned bits.
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Bring to a boil; cook and stir for 2 minutes.
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Strain sauce; set aside.
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In the same skillet, cook mushrooms in remaining oil for 2 minutes; drain.
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Stir sauce into mushrooms; heat through.
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Pour over chicken; sprinkle with parsley.
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Bake, uncovered, in a preheated 350° oven for 25-30 minutes or until chicken juices run clear.