Cook the pasta according to package instructions.
In a large skillet, heat a tablespoon of olive oil over medium heat.
Add the diced onion to the skillet and sauté until translucent.
Stir in the minced garlic and cook for another minute.
Add the ground beef, breaking it apart with a spoon, and cook until browned.
Pour in the crushed tomatoes and Add the Italian seasoning, salt, and pepper.
Let the sauce simmer for about 10 minutes.
Combine the cooked pasta with the sauce, adding reserved pasta water if needed.
Serve hot, topped with grated Parmesan cheese if desired.