Preheat the oven to 375℉.
Next, in a frying pan brown the ground beef. Once ground beef is cooked remove from heat.
Transfer the cooked ground beef into the baking dish and add in the cream of mushroom soup. Taste for salt and pepper then mix in the diced onions.
Spread out in the dish then top with the green beans and shredded cheese. Next, cover the top of the dish with the frozen hash browns.
Then, place the hamburger tater tot casserole into the oven and bake uncovered for 35-40 minutes or until the hash browns are crispy.
Allow the casserole to cool before serving.