Preheat oven to 425°F*. Line a sheet pan with parchment paper or aluminum foil.
Place the cubed potatoes on the pan. Drizzle with olive oil and sprinkle with Lawry’s seasoned salt and pepper. Toss with your hands until evenly coated, then spread into a single layer. Bake, uncovered, for 45-60 minutes, turning once halfway through, until golden and crispy. Allow potatoes to cool for at least 15 minutes before mixing.
While the potatoes bake, cook the beef. In a large skillet over medium heat, add ground beef and diced yellow onion. Season with hamburger seasoning and seasoned salt. Cook, breaking apart the meat as it browns, until fully cooked and no pink remains. Drain any excess grease and let cool slightly.
In a small bowl, whisk together sour cream, ketchup, red wine vinegar, mustard, and paprika until smooth. Set aside.
In a large mixing bowl, combine the roasted potatoes, cooked beef mixture, bacon, shredded cheese, chopped pickles, and diced tomatoes.
Pour the sauce over the mixture and gently fold until everything is coated.
Serve warm for the best flavor, or chill in the refrigerator for at least 1 hour and let warm slightly before serving.
Garnish with extra cheese, bacon, pickles, and diced tomatoes if desired.