Slice the Andouille sausage in half lengthwise and slice half moons 1/4 inch thick. For regular pork or beef sausage, just slice 1/4 inch thick. Set aside.
In a large non stick pan, heat a splash of olive oil, when hot, add the cubed chicken and season with the Chicken Seasoning spices to taste, just a bit of each spice will do. Lightly brown the chicken, no need to cook through, over cooked chicken = tough chicken. When lightly browned, remove from the pan to a large bowl and set aside. If there is water in the pan, pour that off.
Same pan, add the sausage and brown that up, remove from the pan and add to the bowl with the chicken and set aside.
Same pan, add the bell peppers, saute for about 5 minutes then add the garlic and shallots. Saute for about 15 minutes or until the bell peppers are just softened yet still crunchy. If using the the optional mushrooms, add those now and saute to just soften them. Remove from heat and set aside. Now follow either Method 1 or Method 2 for the final preparation.