Heat a large skillet over medium heat and cook the ground meat until browned. Drain excess grease if needed.
Add the onion and cook until softened. Stir in garlic and cook until fragrant.
Pour in marinara sauce and water, then stir to combine.
Add broken lasagna noodles, pressing them down so they are mostly submerged.
Bring to a gentle simmer, cover, and cook for 18–20 minutes, stirring occasionally, until the pasta is tender.
Season with salt, pepper, and Italian seasoning.
Dollop ricotta over the top, then sprinkle with mozzarella and Parmesan.
Cover and cook for 3–5 minutes, until the cheese is melted.
Remove from heat and let rest for 5 minutes before serving.