01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
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 into a smashed disk.
04 - Drizzle the smashed potatoes generously with olive oil and sprinkle with garlic powder, smoked paprika, salt, and black pepper. Roast for 18–22 minutes until golden and crispy, flipping halfway through for even browning.
05 - While the potatoes roast, season the ground beef with salt, black 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 cast-iron skillet or flat griddle over medium-high heat. Place the beef balls onto the hot surface and smash each one firmly with a sturdy spatula to flatten. Cook for 2–3 minutes per side until a deep golden crust forms and the patties are 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, and paprika until smooth and well combined. Adjust salt and pepper to taste.
08 - Divide the crispy smashed potatoes among 4 bowls. Layer each with shredded lettuce, diced tomato, red onion slices, pickles, and shredded cheddar cheese. Crumble or slice the cooked burger patties over the top. Drizzle generously with special sauce and serve immediately while hot.