Preheat oven to 400°F and line a sheet pan with parchment paper or grease it well with butter or oil
In a skillet over medium heat, cook the ground beef with salt, pepper, garlic powder, and onion powder until browned. Drain excess grease and set aside.
In a small bowl, mix together all sauce ingredients until smooth. Set aside.
Lay the tortillas on the sheet pan overlapping slightly and keeping half of the tortilla off the sheet (so you can fold in afterwards)
Spread the cooked beef evenly over the tortillas
Sprinkle cheese on top
Add pickles and onions
Drizzle generously with special sauce (leave some for dipping)
Finish with another layer of cheese
Fold each side of the tortillas inward toward the center, creating a sealed, layered wrap.
Place another sheet pan on top (to press it down) and bake for 15–20 minutes, until golden and crispy.
Remove from the oven, let cool slightly and slice. Add shredded lettuce before serving for that classic Big Mac crunch.