Preheat oven to 350 degrees.
Gather the ingredients.
Spray a 9" x 13" baking dish with non-stick cooking spray. Set aside.
If your chicken breasts are raw, boil them for about 15 minutes in a large pot, reserving the water to be used later for cooking the pasta.
Once the chicken breasts are almost done, remove them from the hot water to a cutting board to cool slightly. In addition, remove 1 cup of the water and set aside.
Bring the water that was used to cook the chicken to a boil and add the pasta, cooking until al dente.
While the pasta is cooking, shred the chicken and place in a large bowl.
In the same large bowl, add the Cream of Chicken Soup, 1 1/2 cups of the Shredded Cheddar Cheese, the bell pepper and spices. Mix well with the shredded chicken.
Add the cooked spaghetti and the 1 cup of reserved water to the chicken mixture, mixing well.
Dump this mixture into the prepared baking dish and spread out evenly. Top with the remaining cheese.
Bake uncovered for 40-45 minutes, covering with foil if the cheese starts to brown.
Top with sliced green onions and serve. Yummy!