Mix marinara, water, ricotta, and seasonings directly in a 9x13 dish
Add the broken noodles, frozen meatballs, spinach, and half the mozzarella
Stir it all together and press the noodles down into the sauce
Top with the rest of the mozzarella and cover tightly with foil
Bake at 375°F covered 45–50 min, then uncovered 10–15 min
Let it rest 10 min before you scoop into it
