Preheat the oven to (350°F) = (176°C) degrees.
Chop the chicken into bite-sized pieces.
Chop the onion into bite-sized pieces.
Chop the celery into bite-sized pieces.
Combine all of the ingredients in a large bowl, except the almonds. Stir the mixture until blended well. Set the almonds aside.
Grease a 9 by 13-inch baking dish. Scoop the ingredients into the baking dish.
Bake uncovered for 30-40 minutes, or until heated through. Add the almonds to the top of the casserole during the last 5-10 minutes of baking.