In a large Dutch oven or saucepan, boil the spaghetti noodles as directed. Drain and let sit in colander while you prepare the sauce. Do not rinse.
Meanwhile, cook the spinach in the microwave as directed. Drain off the liquid, but dont squeeze it dry.
Return the warm Dutch oven or saucepan to the burner and add the diced tomatoes with their juices, the spinach and remaining liquid, and the cooked and shredded chicken. Stir until well combined. Season with salt and pepper, to taste.
Reintroduce the spaghetti noodles and toss well. Sprinkle with Parmesan cheese before serving.
Prepare garlic bread, as side dish.
Serve Chicken Spaghetti with Spinach with a side of garlic bread.