Prepare the sauce by mixing mayonnaise, pickles, mustard, garlic powder, black pepper, paprika, lemon juice, and a pinch of salt with chopped onion.
In a bowl, mix ground beef with salt, black pepper, and garlic powder until well combined.
Form the mixture into patty shapes.
Heat a pan or grill and smash the patties firmly.
Cook until golden brown on both sides. Flip when done.
Assemble the burger by placing cheese, lettuce, and sauce between the buns and stacking the patties.
Season fries with paprika and serve.