To a large bowl add in the potatoes o'brien, ham, sour cream, cream of chicken soup, 1/2 of the cheese, and salsa stir well.
Spray a large casserole dish or 9x13 baking dish with non-stick spray add the casserole in and spread it out. Sprinkle the remaining 1/2 cup of cheese on top and bake for 40 minutes or until bubbly and golden on the top and edges. Enjoy!