Spinach and Tomato Spaghetti

Today for lunch, we didn't really have anything that sounded good. So I scoured the cupboards and created this pasta dish that turned out really delicious and it was FAST and EASY!
Had I had a couple of other ingredients, I probably would have added them, but I will post the recipe just as I made it and then below specify the other ingredients that would be good added to it.

Ingredients:
16 oz. spaghetti noodles
4 Tblsp Olive Oil
5 or 6 cloves of garlic chopped
1 onion chopped
1 pkg frozen spinach
1 can stewed tomatoes (fresh tomatoes would be better!)
1 cup shredded Parmesan cheese

Boil Spaghetti while you heat the olive oil in a pan. Once the oil is hot, add the garlic and onions and saute. Once the garlic is browned and onions are tender, turn the pan down to low and add the spinach and let cook until the pasta is done. Once the pasta is done, add it to the veggies and stir. Then add the tomatoes and cook through for a few minutes. Stir in the cheese and a ladle of the pasta water. Stir together until cheese is melted and serve.
It was actually really delicious!

*Had I had fresh mushrooms, I would have sauteed those with the garlic and onions and it would have been delicious! Also, chicken or shrimp would be great in it if you want meat in it. And instead of stewed tomatoes, grape or cherry tomatoes halved would have probably been better. You could also substitute broccoli for the spinach if you want.