Preheat your oven to 375°F (190°C).
In a large skillet, brown 1 pound of ground beef over medium heat.
Drain excess fat and add 2 cups of marinara sauce to the skillet.
In a baking dish, spread a thin layer of meat sauce on the bottom.
Layer 3 no-boil lasagna noodles over the sauce.
Add half of the remaining meat sauce over the noodles.
Sprinkle 1 cup of ricotta cheese on top of the sauce.
Add 1 cup of shredded mozzarella cheese on top of the ricotta.
Repeat the layers: noodles, sauce, ricotta, and mozzarella.
Finish with a final layer of noodles and remaining sauce, topped with mozzarella.
Cover with foil and bake for 25 minutes.
Remove foil and bake for an additional 10 minutes until cheese is bubbly.