Preheat your oven to 350°F (175°C) and lightly spray a 9x13 baking dish with vegetable oil spray.
Cook spaghetti according to package instructions until al dente. Drain and do not rinse.
Transfer the drained spaghetti to a large mixing bowl. Drizzle with olive oil, and add kosher salt and black pepper. Mix well.
Pour marinara sauce over the spaghetti and add the cooked meatballs. Stir gently to combine.
Fold in 1 cup of shredded mozzarella cheese into the mixture.
Spread the spaghetti mixture evenly in the prepared baking dish. Cover with aluminum foil and bake for 30 minutes.
After 30 minutes, remove the foil and sprinkle the remaining mozzarella cheese on top. Bake uncovered for an additional 10 minutes, until the cheese is melted and bubbly.
Let cool for a few minutes before serving. Enjoy!
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or microwave.