Preheat oven to 400°F. Spray 9x13-inch baking dish with non-stick cooking spray. Set aside.
Cook and stir ground beef in a large skillet over medium heat until no longer pink and completely browned, 7 to 10 minutes; season with salt and black pepper.
Stir cream of mushroom soup, green beans, and corn into the cooked ground beef; pour the mixture into the prepared baking dish.
Layer tater tots evenly over the ground beef mixture; top with Cheddar cheese.
Bake for 30-45 minutes or until tator tots are crispy.
Notes
Swap Out the Ground Meat. You can easily make this casserole with any type of ground meat. So give it a try with ground chicken or turkey too.
Using Regular Ground Beef? If you are using a ground beef with more fat content I highly recommend draining it after you brown it in the skillet. This will keep it from being overly greasy.
Don't Like Mushrooms? You can easily swap out the cream of mushroom soup for different type of creamy soup that you enjoy using in casseroles.
Change Up the Vegetables. You can easily swap it out for other types of canned vegetables if you prefer. I find that mixed vegetables, carrots, and peas all work great.