Brown the ground beef and diced onion in a skillet over medium heat. Add salt and pepper. Cook until fully browned, then drain any excess grease.
In a small bowl, stir together mayo, ketchup, mustard, garlic powder, and onion powder to make the Big Mac sauce.
Warm the tortillas slightly so they’re easier to fold without tearing.
Spoon the beef mixture down the center of each tortilla.
Top with shredded lettuce, cheese, pickles, and a drizzle (or flood) of sauce.
Wrap it up like a pro burrito roller and serve while warm. Optional: give it a little pan-fry on each side for a crispy outer shell. You earned it.