Preheat oven to 375°F.
Cook beef in skillet until browned.
Add onion and garlic, cook until soft.
Stir in ketchup and mustard.
Add Worcestershire sauce to the beef.
Add salt and pepper to taste.
Stir in cream of mushroom soup.
Pour in milk and mix well.
Add sour cream to the mixture.
Pour mixture into baking dish.
Top with half the shredded cheese.
Place tater tots on top evenly.
Bake uncovered for 35 minutes.
Add remaining cheese on top.
Bake for 10 minutes more.
Remove and let cool for 5 minutes.
Sprinkle chopped pickles if using.
Serve your Cheeseburger Tater Tot Casserole Recipe warm.