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Cook and drain Fettucine. Meanwhile, brown sausage in an oven-proof skillet (ie, iron skillet)and drain. Add onion and cook until tender. Stir in tomatoes and oregano and bring to a boil. Reduce heat to a simmer and simmer for 20 minutes, stirring occasionally. Turn off stove and stir in Mozzarella and 1/4 cup parmesan.