Cook the spaghetti in salted boiling water according to package instructions until al dente. Drain and set aside.

In a large skillet, heat olive oil over medium heat. Add ground beef, cooking until browned and fully cooked.

Stir in marinara sauce and simmer for 5-7 minutes.

Mix cooked spaghetti with the meat sauce until evenly coated.

In a bowl, combine half of the mozzarella and Parmesan cheeses; fold into the pasta mixture, reserving the rest for topping.

Preheat oven to 350°F (175°C). Transfer mixture to a greased baking dish, top with remaining cheese, and bake for 25-30 minutes until bubbly.