Mom's Sour Cream Chicken Casserole
Preheat oven to 350 F. Spray a 9x13 pan with non-stick spray (I used 4 individual baking dishes, plus a square baking dish for the extra).
In a large bowl, combine the sour cream, cream of mushroom soup and cheese. Add the chicken, mushrooms and onions. Season to taste with salt and pepper.
Spread in the baking dishes. In a small bowl, pour the melted butter over the crumbled cheese crackers and toss with a fork to moisten. Sprinkle crackers over the chicken.Bake for 30-40 minutes, until the center is bubbling and the crackers are golden.