Preheat the oven to 375 degrees. Spray a 9x13 pan with cooking spray.
In a skillet, cook ground beef breaking into small pieces; until no longer pink. Drain grease.
In a large bowl, whisk cream of mushroom soup, milk, and sour cream until smooth.
Add onion powder, salt, and black pepper. Mix until combined.
With a wooden spoon stir in ground beef, corn, 1/2 cup of cheese, and bacon until well mixed.
Pour into the prepared pan. Layer 1/2 cup cheese and tater tots on top.
Bake for 40 minutes; until bubbly and tots are browned. Then top with remaining 1/2 cup cheese and bake until melted; about 5 minutes.
Serve with an additional sprinkle of bacon, if desired.