Cook pasta according to package directions, about 12 minutes for al dente; drain.

Meanwhile, in a large skillet over medium heat, sauté onions in olive oil. Add sausage and cook until no longer pink; drain. Stir in tomato and basil sauce; heat through and set aside.

In a large bowl, combine the eggs, ricotta cheese, 1 cup mozzarella cheese, Parmesan cheese and parsley. Gently fold pasta into cheese mixture.

Preheat oven to 350 degrees. Spray a 13 x 9-inch baking dish with non stick cooking spray.

Spoon some sauce in the bottom of the dish. Layer half of the pasta mixture and half of the meat sauce. Repeat layers.

Cover with foil and bake for 20 minutes or until heated through and bubbly.

Sprinkle with remaining mozzarella cheese. Bake, uncovered, for an additional 5-10 minutes or until cheese is melted. Sprinkle with additional fresh chopped basil if desired.