Creating this amazing Tater Tot Casserole is straightforward if you follow these clear steps:

1. Preheat your oven to 350°F (175°C).
2. Brown the Meat: In a skillet over medium heat, cook the ground beef and chopped onion until fully browned. Drain any excess fat.
3. Mix Ingredients: In a large bowl, combine the cooked beef and onions with cream of mushroom soup, frozen mixed vegetables, cheese, salt, pepper, and optional seasonings.
4. Prepare Baking Dish: Grease a 9×13-inch baking dish or use non-stick spray for easy cleanup.
5. Spread Mixture: Pour the meat and vegetable mixture evenly into the bottom of the prepared baking dish.
6. Top with Tater Tots: Arrange the frozen tater tots over the meat mixture in a single layer.
7. Bake: Place in the preheated oven and bake for 30 minutes, or until the tater tots are golden brown and crispy.
8. Cool Slightly: Once done, remove from the oven and let it cool for about 5 minutes before serving for optimal slicing.

By following these instructions, you can whip up a Tater Tot Casserole effortlessly and enjoy its amazing flavors.