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.
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.
05 - While the potatoes roast, season the ground beef with salt, pepper, and Worcestershire sauce. Mix gently and form into 4 equal, loosely packed balls. Avoid overworking the meat to keep it tender.
06 - Heat a large skillet or griddle over medium-high heat. Place the beef balls onto the hot surface and 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.
07 - In a small bowl, whisk together the mayonnaise, ketchup, yellow mustard, pickled relish, apple cider vinegar, garlic powder, onion powder, paprika, and salt and pepper to taste until smooth and well combined.
08 - Divide the crispy smashed potatoes among 4 bowls. Layer each with shredded lettuce, diced tomato, sliced red onion, dill pickles, and shredded cheddar cheese. Crumble or slice the cooked burger patties over the top. Drizzle generously with special sauce.
09 - Serve immediately while hot and enjoy.