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Preheat oven to 425 degrees F.
Spray a 2-quart (about 8-inch square) baking dish with cooking spray. Place onion, uncooked pasta, grated cheese, marinara sauce, and water in the dish and stir to combine. Add the uncooked ground beef to the dish, breaking it up into small pieces with your fingers. Stir to combine.
Cover tightly with foil and bake for 25 minutes. Stir, cover, and return to oven for 15-20 more minutes, or until pasta is tender and beef is cooked through.