Start by preheating your oven to 400 degrees F. Prepare a casserole dish with nonstick cooking spray and set aside.
In a skillet cook ground beef and diced onion on medium heat. Add seasoning salt to ground beef. Cook ground beef until fully brown. Stir in tomato sauce, brown sugar, and Worcestershire sauce. Add this to the bottom of your casserole dish.
Place tater tots on top of the beef in the casserole dish. Top with shredded cheese. Bake for 25-30 minutes or until tater tots are fully cooked.