Preheat oven to 400°F and lightly grease a 13x18-inch baking sheet with at least 1-inch high lip.

In a large skillet over medium heat, brown and crumble the Italian sausage until no pink remains. Drain excess grease and mix in 1 jar of marinara sauce.

In a bowl, mix ricotta, eggs, 1/2 cup Parmesan, salt, pepper, and red pepper flakes until smooth.

Spread half the second jar of marinara sauce on the bottom of the prepared sheet pan.

Layer uncooked lasagna noodles on top of the sauce to cover the pan.

Spread the ricotta mixture over the noodles and sprinkle with half of the mozzarella and provolone cheeses.

Spread the meat sauce over the cheese layer evenly.

Add another layer of lasagna noodles and top with the remaining marinara sauce.

Cover the sheet pan tightly with foil and bake for 30 minutes.

Remove foil, sprinkle with remaining mozzarella and provolone, and bake uncovered for 10-15 minutes until cheese is fully melted.