Brown sausage in skillet, set aside.
Saute onion and carrot in olive oil for 5 minutes over medium heat. Add eggplant and cook until softened, about 5 more minutes. Add prosciutto and garlic.
Cook, stirring for 3-4 minutes until garlic is fragrant.
Add sausage, 3 cups Marinara sauce and Italian seasoning. Reduce heat and simmer for 15 minutes.
Spray a deep lasagna style dish with cooking spray.
Add 1/2 of sauce mixture to dish.
Layer 3-4 lasagna sheets on top, breaking pieces to fit if necessary.
Top lasagna noodles with dabs of ricotta and season with salt and pepper.
Top with half of each cheese.
Add remaining tomato mixture, top with another layer of lasagna and remaining ricotta.
Pour remaining 1 cup sauce over top, then sprinkle with remaining cheese.
Cover and refrigerate up to 24 hours until baking.
Bake at 350 for 1 hour or until heated through and bubbling