Follow these simple steps to create your Chicken Spaghetti:

1. Cook the Spaghetti: In a large pot, cook spaghetti according to the package directions. Drain and set aside.
2. Sauté Vegetables: In a skillet, heat olive oil over medium heat. Add bell pepper and onion, sautéing until they are tender, about 5 minutes.
3. Combine Ingredients: In a large mixing bowl, combine the cooked spaghetti, chicken, cream of mushroom soup, chicken broth, diced tomatoes, sautéed vegetables, garlic powder, onion powder, salt, and black pepper. Mix well until fully incorporated.
4. Transfer to Casserole Dish: Preheat your oven to 350°F (175°C). Transfer the mixture to a greased 9×13-inch casserole dish, spreading it evenly.
5. Top with Cheese: Sprinkle the shredded cheddar cheese on top of the mixture.
6. Bake: Bake in the preheated oven for 25-30 minutes, until the cheese is bubbly and golden brown.
7. Garnish: Remove from oven and allow to cool for a few minutes. If desired, garnish with fresh parsley before serving.
8. Serve and Enjoy: Dish out generous portions and savor the amazing flavors of your homemade Chicken Spaghetti.

These step-by-step instructions will guide you in crafting this incredible dish that is sure to delight everyone.