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 Yukon Gold potatoes and cook for 12–15 minutes until fork-tender. Drain well and let cool slightly.
03 - Arrange the boiled potatoes on the prepared baking sheet. Using a flat spatula or the bottom of a glass, gently press each potato to flatten it. Drizzle with olive oil and sprinkle evenly with garlic powder, smoked paprika, salt, and black pepper.
04 - Roast the smashed potatoes for 18–22 minutes, flipping halfway through, until golden brown and crispy on the edges. Remove from the oven and set aside.
05 - While the potatoes roast, combine the ground beef with salt, black pepper, and Worcestershire sauce in a mixing bowl. Gently mix and form into 4 equal, loosely packed balls. Avoid overworking the meat to keep it tender.
06 - Heat a large cast-iron skillet or flat griddle over medium-high heat. Working in batches if needed, place the beef balls onto the hot surface and immediately smash firmly with a sturdy spatula to flatten into thin patties. Cook for 2–3 minutes per side until a deep golden crust forms and the meat is cooked through. Set aside.
07 - 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. Adjust salt and pepper to taste.
08 - Divide the crispy smashed potatoes among 4 serving bowls. Layer each bowl with shredded iceberg lettuce, diced tomato, thinly sliced red onion, and dill pickle slices. Crumble or slice the cooked burger patties over the top, then add shredded cheddar cheese. Finish with a generous drizzle of special sauce.
09 - Serve immediately while hot. Offer extra special sauce and pickles on the side if desired.