• Preheat the oven to 200℉. Place a baking sheet in the oven to preheat.

Big Mac Sauce

• In a medium bowl, combine the mayonnaise ketchup, sweet relish, mustard, vinegar, sugar, paprika, garlic powder, and onion powder. Cover and place in the refrigerator to let the flavors meld.

Smash Tacos

• Divide the ground beef into 12 equal sized, ball shaped portions.
• Arrange the tortillas on a work surface without overlapping. Add a hamburger ball to the center of a tortilla. Using a metal turner, flatten the hamburger ball out to the edges of the tortilla. Repeat with all remaining tortillas and balls. Lightly season with kosher salt and freshly ground black pepper.
• Heat a large skillet over medium-high heat and add a small drizzle of oil, swirling to spread it out, and heat until shimmering. Add 3 to 4 tacos to the skillet without overlapping, beef side down. Cook 2 to 3 minutes or until the beef has a nice golden brown crust. Reduce the heat to medium-low and flip the taco patties over.
• Top the cooked patties with a slice of cheese, then cover with a lid. Cook for 1 to 2 minutes or until the cheese melts and the taco are lightly charred and crispy. then cover with a lid and cook for another 1-2 minutes, or until the cheese melts and the tortillas are gold and crisp.
• Transfer the patties to the preheated baking sheet and place in the oven to keep warm. Finish cooking the remaining burger tacos.
• Serve the big mac tacos garnished with pickles, lettuce and diced onions. Alternatively, you can serve the garnishes at the table and let everyone add what they like.