01 -
Preheat the oven to 350°F (175°C).
02 -
In a small bowl, mix mayonnaise, ketchup, sweet relish, white vinegar, and onion powder until combined.
03 -
Heat an oven-safe skillet over medium-high heat. Add ground beef and onions, cook until browned, then drain any excess fat.
04 -
Add garlic powder, salt, and black pepper. Stir until incorporated.
05 -
Pour the prepared sauce into the skillet. Add shredded cheddar cheese and mix until combined.
06 -
Place a layer of American cheese over the filling. Add the tater tots on top in an even layer.
07 -
Bake, uncovered, for 40-45 minutes, until the tater tots are crispy.
08 -
Top with shredded lettuce, diced pickles, and finely diced onions before serving.