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Preheat oven to 375 degrees
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Boil noodles according to package directions
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While noodles are boiling, brown the ground meat with onion, celery and mushrooms
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Add tomatoes and bell pepper and cook for 3 to 4 minutes.
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Drain pasta and add to meat and vegetable mixture
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Transfer to a large casserole dish or 9 x 13 pan and bake for 30 minutes.
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Sprinkle with cheese and return to the oven until cheese is melted, about 5 minutes.