Preheat oven to 375 degrees.

In a skillet, brown ground beef with onion until fully cooked; drain of grease.

Add soup and milk to meat mixed and stir until well combined; set aside.

Spray a 9 x 13 inch baking dish with cooking spray and place tater tots in the bottom of the prepared pan.

Sprinkle corn over the tater tots and then pour meat mixture over the corn and tater tots.

Sprinkle with cheese and cover with foil. Bake for 35 minutes at 375. Remove foil and place back in the oven for a few minutes until the cheese is bubbly.