Preheat your oven to 375°F (190°C).
In a skillet over medium heat, cook the hot and sweet Italian sausages, breaking them into small pieces. Once cooked, drain excess fat and set aside.
Boil lasagna noodles according to package instructions until al dente. Drain and lay flat on parchment paper.
In a medium bowl, combine the 4 cups ricotta, 2 cups mozzarella, 1/2 cup Parmesan, egg, salt, and pepper. Mix until smooth.
Stir the cooked sausage into Rao’s Caramelized Onion Sauce.
Spread a layer of the sauce mixture on the bottom of your baking dish.
Lay each noodle flat, spreading 3-4 tablespoons of the ricotta mixture evenly. Roll each noodle and place in the dish.
Pour the remaining sauce mixture over the lasagna roll-ups. Top with 1/2 cup Parmesan.
Cover with foil and bake for 30 minutes. Remove the foil and bake for an additional 10-15 minutes until the cheese is bubbly and golden.
Let the lasagna rest for 10-15 minutes before serving. Garnish with parsley if desired.