Mexican Chicken Spaghetti

1 lb boneless, skinless chicken breasts

1 lb velveeta cheese, regular or mexican

1 can(s) rotel tomatoes, regular or hot

1 lb spaghetti pasta

1 stick butter

1 can(s) cream of chicken soup, undiluted

1 can(s) cream of mushroom soup, undiluted

1 medium onion, chopped

1 bell pepper, red or green, chopped

salt and pepper to taste

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