01 -
Set the oven to 350°F and lightly grease a large casserole dish.
02 -
In a large pot over medium heat, cook chicken breasts for 6 to 7 minutes per side until thoroughly cooked and golden. Allow to cool briefly, then shred or chop the chicken.
03 -
Bring salted water to a boil and cook spaghetti for 8 to 10 minutes until al dente. Drain well and set aside.
04 -
In a large bowl, mix the shredded chicken, cooked spaghetti, cream of chicken soup, chopped bell peppers, paprika, cayenne pepper, garlic powder, sliced green onions, and half of the cheddar cheese until thoroughly combined.
05 -
Transfer the mixture evenly into the prepared casserole dish. Sprinkle with the remaining cheddar cheese. Bake for 25 to 30 minutes, or until bubbling and the cheese is golden brown.