Preheat oven to 350 degrees. Spray a casserole dish with cooking spray.
Prepare an 8 ounce box of Banza pasta according to the instructions. Drain and set aside.
In a large mixing bowl, combine chicken, 3 oz of shredded cheese, diced bell pepper and onion, seasoned salt, cayenne pepper, cream of mushroom soup, and 1/2 cup of chicken stock. Add an additional 1/2 cup of chicken stock, if needed.
Pour pasta mixture into the casserole dish. Top with remaining 2 oz of shredded cheese.
Bake in the preheated oven for about 45 minutes, or until dish is bubbling. If the cheese starts to get too brown on top, cover with aluminum foil for the remainder of the baking.