The onion-pepper mixture and sausage in this recipe are used in the Italian Sausage Sandwiches.
Preheat oven to 375°.
Heat 2 teaspoons oil in a large skillet over medium heat. Add onion, garlic, and 1/4 teaspoon ground red pepper; cover and cook 10 minutes or until onion is golden brown, stirring frequently. Remove from skillet.
Heat 2 teaspoons oil in a large skillet over medium heat. Add bell peppers and 1/4 teaspoon ground red pepper; sauté 10 minutes or until soft. Remove from heat. Stir in onion mixture and salt. Reserve half for Italian Sausage Sandwiches.
Cook sausage links according to package directions. Reserve 4 links for Sandwiches. Chop remaining 4 links.
Spread 3/4 cup pasta sauce in the bottom of an 8-inch square baking dish coated with cooking spray. Arrange 2 noodles over pasta sauce. Sprinkle half of the cream cheese over the noodles; top with 1/4 cup Parmesan, 1 cup onion-pepper mixture, and half of the chopped sausage. Repeat layers, ending with sausage. Top with remaining lasagna noodles; spread remaining pasta sauce over noodles. Sprinkle with mozzarella.
Cover dish with foil, tenting to prevent foil from touching top layer. Bake at 375° for 45 minutes. Remove foil; bake 10 minutes or until golden. Let stand 5 minutes before serving.