01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper and set aside.
02 - Bring a large pot of salted water to a rolling boil. Add the baby potatoes and cook for 12–15 minutes until fork-tender. Drain well and let cool slightly. Place the potatoes on the prepared baking sheet and, using a flat spatula or the bottom of a glass, gently press each potato to flatten and smash it.
03 - Drizzle the smashed potatoes with olive oil and season evenly with garlic powder, smoked paprika, salt, and black pepper. Roast in the oven for 18–22 minutes until golden brown and crispy, flipping halfway through for even browning.
04 - While the potatoes roast, season the ground beef with salt, black pepper, and Worcestershire sauce. Gently mix and form into 4 equal, loosely packed balls. Avoid overworking the meat to keep it tender.
05 - Heat a large skillet or griddle over medium-high heat. Working in batches if needed, place the beef balls onto the hot surface and immediately smash firmly with a spatula to flatten into thin patties. Cook for 2–3 minutes per side until deeply browned and cooked through. Remove and set aside.
06 - In a small bowl, whisk together the mayonnaise, ketchup, yellow mustard, pickled relish, apple cider vinegar, garlic powder, onion powder, and a pinch of paprika until smooth and well combined. Season with salt and pepper to taste.
07 - Divide the crispy roasted potatoes among 4 serving bowls. Top each bowl with shredded lettuce, diced tomato, sliced red onion, and pickle slices. Crumble or slice the cooked burger patties over the top and add shredded cheddar cheese. Drizzle generously with the special sauce.
08 - Serve immediately while hot and enjoy.