In a large skillet, brown the ground beef over medium heat with the chopped onion and minced garlic.
Drain any excess fat from the skillet, if necessary, then stir in the marinara sauce and Italian seasoning.
Add the broken lasagna noodles directly into the skillet, pressing them down into the sauce.
Spoon dollops of ricotta cheese over the noodle mixture and gently stir to incorporate.
Sprinkle shredded mozzarella and grated Parmesan cheese over the top.
Cover the skillet and simmer on low for about 20-25 minutes, or until the noodles are tender.
Remove the lid and allow the lasagna to cool for a few minutes before serving.