1. In a large saucepan or pot, cook pasta according to package directions. Drain and return to saucepan. Set aside.
2. Meanwhile, in large skillet, cook sausage and onion until sausage is no longer pink. Drain. Stir flour, dried basil, salt, and pepper into sausage mix. Add milk all at once. Cook and stir until thickened and bubbly. Cook and stir 1 minute more. Stir in undrained tomatoes and cheeses. Pour over pasta. Toss to mix.
3. Spread mixture in a 3-quart rectangular baking dish. Cover with foil. Bake at 350 for 25-30 minutes or until hot. If desired, garnish with fresh basil and additional Romano cheese. Makes 6-8 servings.