Preheat the oven to 350°F (175°C).
In a large skillet over medium heat, cook the ground beef and diced onion until the meat is no longer pink and the onion is soft. Drain any excess grease.
Spread the beef and onion mixture evenly into the bottom of a 9×9-inch casserole dish.
Sprinkle 1/4 teaspoon of seasoned salt over the beef layer.
Top with all the shredded cheddar cheese in an even layer.
Spread the cream of chicken soup over the cheese layer.
Arrange the frozen tater tots on top of the soup layer.
Sprinkle the remaining 1/4 teaspoon of seasoned salt over the tater tots.
Cover the dish with aluminum foil and bake for 20 minutes.
Remove the foil and bake for another 20 to 25 minutes, or until the tater tots are golden and crispy.
Serve hot and enjoy!