Sauté the onion: In a medium pan over medium heat, add a little olive oil and cook the chopped onion until golden brown. Set aside.
Roast the potatoes: Preheat the oven to 425°F. Wash and cut the potatoes into 1-inch cubes. Place on a foil-lined baking sheet and toss with olive oil, salt, garlic powder, paprika, and black pepper. Roast for about 20 minutes, or until golden and crispy.
Make the special sauce: In a bowl, combine the sautéed onion, mayonnaise, yogurt, ketchup, relish, and mustard. Stir until smooth and set aside.
Cook the burger: In the same pan used for the onion, cook the ground beef over medium heat with onion powder, garlic powder, paprika, Worcestershire sauce, and salt until browned. Top with cheddar slices, cover with a lid, and let the cheese melt.
Assemble the bowl: In a bowl, layer the chopped lettuce, cooked burger mixture, and roasted potatoes. Top with dill pickles, cherry tomatoes, red onion, sesame seeds, and a generous drizzle of special sauce.
