Brown the ground beef and onion in a large oven safe skillet. Drain excess grease if needed.
Add garlic, Worcestershire sauce, Cowboy Butter seasoning, garlic powder, onion powder, salt and pepper. Cook for 2 minutes.
Stir in cream of mushroom soup, milk, sour cream and cheddar cheese until creamy and combined.
Fold in the drained green beans.
Air fry tater tots at 400°F for 12 minutes, shaking halfway through.
Top the beef mixture with the tater tots.
Bake at 375°F for 15–20 minutes, until bubbly and golden.
Let sit for 5 minutes before serving.