In a small bowl, whisk together the Greek yogurt, mustard, pickle juice, finely diced dill pickles, smoked paprika, garlic powder, and onion powder until the sauce is smooth.
Heat the extra virgin olive oil in a large skillet over medium-high heat.
Add the ground beef to the skillet, seasoning evenly with sea salt and black pepper.
Cook the beef, breaking it into small crumbles with a spatula, until it is thoroughly browned and cooked through, approximately 5 to 7 minutes.
While the beef cooks, finely shred the romaine lettuce and dice the white onion.
Place the shredded romaine lettuce into a large serving bowl.
Top the lettuce with the hot cooked beef and immediately sprinkle with the shredded sharp cheddar cheese so it begins to melt.
Scatter the diced white onion over the beef and drizzle the prepared special sauce generously across the bowl.
Garnish with toasted sesame seeds and serve immediately while the beef is warm and the lettuce is crisp.