In a large bowl, combine the cooked chicken, celery, pimentos, green onions, artichoke hearts, sliced almonds, cheese, lemon juice, salt, and pepper. Add mayonnaise and mix until creamy.
Transfer the mixture to a baking dish. Bake for about 25 minutes until the casserole is heated through.
Top with a generous layer of potato chips and bake for another 5 minutes.