This was my childhood favorite casserole and was the dish that won Art over when we were dating!
In a large mixing bowl, add chicken, vegetables, 2/3rds of cheese and onion rings, cans of soup, and milk. Mix well.
In a lightly greased 9x13" baking dish, add chicken mixture. Bake in preheated 350° oven for 20 minutes.
After 20 minutes of baking, remove from oven and top with remaining cheese and onion rings.
Open and gently unroll can of crescent roll dough. Cut into strips, lenthwise. Using a lattice pattern, lay the strips in a crisscross pattern on top of the casserole. Bake for another 15-20 minutes or unti biscuit topping is golden brown.
Serve with rice to stretch the casserole. Enjoy! :)