Mix mayonnaise, sugar-free ketchup, mustard, relish, garlic powder, onion powder, paprika, and pickle juice in a bowl. Stir well until smooth. Place the sauce in the refrigerator while preparing the burgers.

Place the ground beef onto a tray. Divide it into eight equal portions. Roll each portion into a loose ball. Do not press the meat tightly because loose beef creates crispier edges.

Place a cast iron skillet over high heat. Allow it to become very hot before cooking. A hot skillet creates the crispy golden crust that makes smash burgers taste amazing.

Place one beef ball onto the hot skillet. Use a sturdy metal spatula to press it flat. Season with salt, pepper, and garlic powder immediately after smashing.

Leave the burger untouched for about two minutes. The beef will develop crispy brown edges. Avoid moving the patty because this helps create the best crust.

Carefully flip the burger with your spatula. Place one slice of cheddar cheese on top. Cook for another minute until the cheese melts completely over the juicy beef.

Repeat the same process with all remaining beef portions. Keep the cooked patties warm on a plate covered loosely with foil while finishing the rest.

Place shredded lettuce onto a serving plate. Add two cheesy smash patties. Top with diced onions, dill pickles, more lettuce, and plenty of creamy keto burger sauce.

Serve immediately while everything is hot and fresh. Enjoy every bite with extra sauce, crunchy pickles, and crisp lettuce for the best homemade burger experience.