Creating Big Mac Style Smash Burger Tacos is simple if you follow these straightforward steps:

1. Prepare the Sauce: In a small bowl, mix together mayonnaise, ketchup, mustard, and dill pickle relish. Set aside.
2. Cook the Beef: Heat a skillet over medium-high heat. Once hot, add the ground beef, breaking it up into smaller chunks. Season with salt and pepper. Let it sear for about 2-3 minutes without moving it.
3. Smash the Patties: Using a spatula, smash the beef down to create a thin patty. Cook for another 2-3 minutes until browned, then flip and place a slice of cheese on top. Cook until the cheese melts.
4. Warm the Tortillas: While the patties are cooking, warm the flour tortillas in a separate pan or microwave until soft and pliable.
5. Assemble the Tacos: Place a cheesy beef patty on each tortilla. Top with chopped onions, shredded lettuce, diced tomatoes, and a generous drizzle of the prepared sauce.