Preheat oven to 425°F.
Toss diced Yukon gold potatoes with olive oil, salt, black pepper, garlic powder, smoked paprika, and arrowroot if using.
Spread the potatoes evenly on a rimmed sheet pan, making sure they are not crowded.
Roast for 25–30 minutes, flipping halfway through, until golden and crispy.
While the potatoes cook, heat a skillet over medium-high heat and add the ground beef.
Press the beef flat and allow it to brown before breaking it up.
Add garlic powder, onion powder, salt, black pepper, Worcestershire sauce, and mustard. Cook until the beef is browned with slightly crispy edges.
In a bowl whisk together Greek yogurt, avocado oil mayo, ketchup, mustard, chopped pickles, pickle juice, and smoked paprika until smooth.
To assemble, divide the crispy potatoes and seasoned beef into bowls.
Top with shredded romaine, cheddar, tomatoes, red onion, pickles, and a generous drizzle of special sauce.