Mix marinara, water, ricotta, and seasonings in a 9x13 dish
Add broken noodles, frozen meatballs, spinach, and half the mozzarella
Stir everything together and press noodles down into the sauce
Top with remaining mozzarella, cover tightly with foil
Bake at 375°F covered 45–50 min, uncovered 10–15 min
Rest 10 min before scooping
