Pre-heat the oven to 350°F with a rack positioned in the center.
Place the chicken, celery, mayonnaise, cheddar cheese, almonds, lemon juice and onion salt in a large bowl; mix to combine well.
Taste for seasoning; add salt and pepper, as needed.
Transfer the chicken mixture to a 9-inch x 13-inch shallow baking dish.
Spread evenly in baking dish and top with the crushed potato chips; add more chips, if needed, to cover the top.
Place in the pre-heated oven and bake, uncovered, until the chips are golden brown and the mixture is warmed through and bubbling lightly at the bottom; 30 to 40 minutes.
Remove from the oven and let sit for 5 to 10 minutes before serving.
