In a small bowl, mix together all the sauce ingredients. Refrigerate until ready to use.
Heat the Blackstone grill over medium high heat (approximately 350 degrees Fahrenheit).
Drizzle the vegetable oil over the grill and spread it around with a spatula.
Divide the beef into 4 ounce balls. Place the beef on the grill. Top each ball with a piece of parchment paper. Use a large spatula or press, press each one down to smash the beef as thin as possible.
Season the beef patties with garlic powder, onion powder, salt and pepper.
Cook for 2-3 minutes until the bottom of the beef is browned and the beef starts to pull away from the grill.
Flip each beef patty.
Then top each beef patty with a tortilla.
Press them down again with the spatula or press.
Cook for approximately 2 more minutes until browned.
Flip again and top each patty with a slice of cheese. Cook for 1 minute until the bottom of the tortillas are browned and the cheese is melted.
Then remove them from the grill.
Serve topped with the lettuce, diced onion and pickles. Drizzle the sauce on top and they are ready to serve and enjoy!