Preheat oven to 375°F (190°C) or according to Tater Tots package directions.

In a large skillet, brown hamburger meat and onion over medium heat. Drain off any excess grease.

Stir in cream of chicken soup and mix well.

Pour the meat mixture into a casserole dish.

Arrange Tater Tots evenly over the top of the meat mixture.

Bake for 25-30 minutes, or until the Tater Tots are golden brown and crispy.

Remove from oven and sprinkle shredded Cheddar cheese over the top.

Return to the oven and bake for another 5 minutes, or until the cheese is melted and bubbly.

Let cool slightly before serving.