Combine your smash burger sauce ingredients in a bowl and set aside in the fridge until ready to serve.
Divide the 1 lb of beef into 6 equal portions and roll them each into a ball. Place the ball into the middle of a tortilla and press down to spread it out into a thin layer to cover as much of the surface of the tortilla as possible. Sprinkle the beef with salt, pepper, and some of the garlic powder.
Heat a cast iron skillet or griddle over medium high heat. Place the tortilla meat-side down and cook for 2-3 mins until browned.
Spray the tortilla with more oil, then flip and add a slice of cheese on top of the meat, and cook for an additional 1-2 minutes.
Serve topped with diced onion, shredded lettuce, pickles, and a drizzle of the big mac sauce. Enjoy!
