Creating the perfect Homemade Southern Chicken Spaghetti Casserole is a straightforward process. Follow these simple steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).
2. Cook the Spaghetti: In a large pot, bring salted water to a boil. Add the spaghetti and cook until slightly underdone (about 7-8 minutes). Drain and set aside.
3. Prepare the Chicken Mixture: In a large mixing bowl, combine the shredded chicken, cream of mushroom soup, cream of chicken soup, chicken broth, milk, diced tomatoes, diced onion, diced bell pepper, minced garlic, Italian seasoning, salt, and black pepper. Stir until well mixed.
4. Combine with Spaghetti: Gently fold the cooked spaghetti into the chicken mixture, ensuring every strand is coated.
5. Transfer to Baking Dish: Pour the combined mixture into a greased 9×13 inch baking dish, spreading it evenly.
6. Top with Cheese: Sprinkle shredded cheddar cheese over the top, and add grated Parmesan cheese if desired.
7. Bake: Place the casserole in the preheated oven and bake for 30-40 minutes or until the cheese is bubbly and golden brown.
8. Cool Slightly: Once baked, remove the casserole from the oven and let it cool for about 5 minutes before serving.
9. Garnish: Sprinkle fresh parsley on top before serving for an added touch of color and flavor.

By following these steps, you are well on your way to creating a delicious casserole that everyone will love!