Cook green beans per package directions. Drain water and set aside.In a large skillet add your butter, celery, onion, mushrooms, chicken bouillon cubes, and ¼ cup water. Cook until onions and celery and soft and the liquid has cooked off.In a large bowl combine your heavy cream, spices, mayonnaise and whisk together. Add your onion mixture, chicken, green beans, ½ of your cheese and stir well.Pour into a 9×13 casserole dish. Spread out your mixture evenly. Sprinkle the other half of your shredded cheddar cheese and place in a pre-heated 400° oven. Cook for 18-20 minutes or until the casserole is bubbling in the middle.Remove from the oven and sprinkle your Crispy Onions over the top.Serve and enjoy!