In a large cast iron skillet or Dutch oven, add the olive oil over medium-high heat.
Add the onion and cook until softened, about 5-7 minutes.
Add the ground beef and sausage, and cook until browned, breaking up the meat into smaller chunks as it cooks.
Once browned, add the garlic, Italian seasoning, and salt, and stir to combine.
Add the marinara and water, giving it a mix and then tuck the lasagna chunks into the sauce .
Bring to a boil and then cover and reduce the heat to low.
Simmer for 20 minutes, stirring, every 7-8 minutes to prevent the bottom from sticking.
After 20 minutes, the lasagna sheets should be cooked.
Add the cottage cheese and Parmesan cheese and stir to combine, cooking another 3-4 minutes.
Sprinkle the lasagna with shredded mozzarella and broil until the cheese is melted and golden, about 2-3 minutes. Keep a close eye on it so it does not burn.
Serve topped with chopped fresh parsley or basil. Enjoy!