Michelle's Chicken Casserole

Chicken (2 cans or equal too.  I like to use a rotisserie chicken)
2 3/4 cup diced celery
3 cup cooked rice
2 cans cream of mushroom
1 can evaporated milk
2 Tbls lemon juice
2 Tbls onion (minced)
1 1/2 cup mayo or mw

Topping:
1 cube butter
Crushed cornflakes (sprinkle on top)

Mix top 8 ingredients, add into a 9x13 baking dish. Sprinkle with cornflakes and drizzle with melted butter.

Cook at 300 for 60 mins.