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Heat oven to 375.
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Spray a 2 quart rectangular glass baking dish with cooking spray.
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In a 10 inch non stick skillet, cook the beef, onion and garlic over medium heat, stirring frequently,until cooked. Add the zucchini, cook 2 minutes.
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Stir in the tomato sauce, diced tomatoes, oregano, salt and pepper. Heat to boiling.
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Toss the sauce with the pasta. Spread in the baking dish. Cover with foil; bake 20 minutes. Sprinkle with the cheese. Bake uncovered, about 5 minutes more or until the cheese is melted.