Add the sausage, onion, and garlic to a large skillet over med-high heat. Brown the sausage and break up with a wooden spoon while it cooks, about 5-10 minutes until no longer pink. Drain any excess fat.
Stir in marinara, water, Italian seasoning, red pepper flakes (optional), and broken lasagna noodles. Bring to a boil, cover, and reduce heat to low. Cook for 15 minutes.
Stir in ricotta, and half of the parm and mozz cheeses. Warm the cheeses through uncovered for about 5 minutes until melted and combined. Sprinkle with remainder of cheese and allow to melt, and garnish with parsley/basil. Serve immediately.
I like to use hot Italian turkey sausage, it has great flavor with a little kick. If you can't find spicy, just add the red pepper flakes to your mild sausage.