Pre-cook Chicken Breasts until cooked thoroughly (20-50 minutes depending on fresh or frozen), then dice
Dice your half Onion and cook until tender (in water or oil)
Prepare Chicken Noodle Pasta side as shown on package, or if you have the soup, prepare with about 4 cups of water for the consistency we're looking for. (I grab the 'double pack' shown whenever possible)
Drain Green Beans and drain or slice Mushrooms and combine these all with prepared Onions, Chicken, Noodle mix, and 2 cups of Shredded Cheese
Pour mixture into 13x9 casserole dish and top with remaining 2 cups of Shredded Cheese, and bake on 425F for 20-25 minutes, turning on your broiler for the last few minutes for your cheese topping if you want
