INGREDIENTS
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1 pound dry ziti pasta
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1 large onion, chopped
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1 small zucchini, cut into small pieces
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2 small summer squash, cut into small pieces
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1 pound sweet Italian sausage
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1 extra big jar spaghetti sauce (or 2 regular)
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8 ounces provolone cheese, sliced
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1 cup sour cream
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8 ounces mozzarella cheese, shredded
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grated Parmesan cheese