Preheat oven to 350 degrees. Spritz baking dish with nonstick cooking spray, set aside.
In a large skillet, over medium heat pour the oil and add the onion. Cook until the onions are translucent.
Add the ground beef. Break the meat into smaller pieces Add the seasonings and cook until the ground beef is browned and there is no more pink.
Drain the majority of fat from the pan.
Add half the burger sauce and the dill relish (or diced pickles). Mix to combine.
Next sprinkle in ¼ cup of shredded cheese. Mix until the cheese is melted.
Pour the ground beef mixture into the prepared casserole dish.
Top with the remaining cheese.
Finish by adding the frozen tater tots in a single layer on top.
Bake in a preheated oven for 40 to 45 minutes or until the tater tots are golden brown.
Cool for a few minutes. Top with your favorite burger fixings and drizzle with the remaining burger sauce. Serve and enjoy!