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Set oven to 350 degrees.
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In a plastic bag, combine flour, salt and pepper and coat the chicken pieces (shake off any excess flour).
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In a fry pan heat the olive oil with butter. Brown the coated chicken pieces on all sides. Place into prepared 2-quart shallow baking dish.
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In the same fry pan, saute the onion and garlic in the same drippings until tender. Stir in mushrooms, pasta sauce and olives; bring to a simmer for 5-6 minutes, stirring with a wooden spoon occasionally.
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Pour the sauce mixture over the chicken pieces. Top with mozza cheese.
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Bake for about 30 minutes, or until chicken is done.