Preheat air fryer to 400°F/205°C for 5 minutes.
Add beef in bowl and combine garlic powder. Stir to combine well.
Spread about ¼ cup of beef on a tortilla. Press or “smash” the meat into the tortilla until it reaches the edges of the tortilla. Repeat this process for all the meat and tortillas.
Season top of meat with salt and pepper.
Place tortilla in air fryer with meat side facing up (air fry in just a single layer, you'll need to cook in batches for most air fryers).
Air fry at 400°F/205°C for 5 minutes or until beef is cooked to your liking and tortilla slightly crispy.
For a Smash Cheeseburger Taco: Top with a slice of cheese and place air fryer basket/tray back in air fryer. Allow to sit in the residual heat for about 1 minute to melt cheese.
Immediately remove from the air fryer and top the meat side with your favorite burger toppings. Gently fold the taco over. Repeat for all the tortillas and meat. Enjoy!
Combine all the burger sauce ingredients (mayo, ketchup, mustard, optional onion, and relish or minced pickles.) Stir until evenly combined. Store in the fridge until ready to use.
