Preheat the oven to 425°F.
Add the diced potatoes to a large sheet pan. Drizzle with olive oil and season with paprika, garlic powder, salt, and pepper. Toss well to coat.
Roast the potatoes for 25 to 30 minutes, stirring once halfway through, until golden and crisp around the edges.
While the potatoes roast, heat a large skillet over medium heat. Add the ground beef and break it up with a spoon.
Season the beef with paprika, garlic powder, salt, and pepper. Cook for 7 to 9 minutes, stirring occasionally, until browned and cooked through.
In a small bowl, whisk together the Greek yogurt, ketchup, mustard, pickle juice, garlic powder, optional mayonnaise, and a pinch of salt until smooth.
Assemble each bowl with a bed of greens, roasted potatoes, cooked beef, cherry tomatoes, pickles, and red onion if using.
Drizzle the burger sauce over the top and serve right away.