In a large pot, cook the chicken breasts over medium heat for 6-7 minutes on each side until golden brown and fully cooked. Remove and set aside.
Boil salted water in a separate pot and cook spaghetti according to package instructions until al dente, about 8-10 minutes. Drain and set aside.
Shred or chop the cooked chicken into bite-sized pieces. In a large bowl, combine chicken, cooked spaghetti, cream of chicken soup, chopped bell peppers, paprika, cayenne pepper, and garlic powder. Mix well.
Grease a casserole dish and pour the mixture into it. Spread evenly and top with half of the shredded cheddar cheese.
Bake in the preheated oven for 25-30 minutes until bubbly and golden brown.
Let it cool for about 5 minutes before serving. Garnish with sliced green onions.
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Notes
Store leftovers in an airtight container in the refrigerator for 3-4 days.