Preheat your griddle to 475–500°F and drizzle down avocado oil.
Place the ground beef balls (about 2.5 oz each) on the griddle.
Sprinkle lightly with taco seasoning.
Place a tortilla directly on top of each beef ball, then smash down with a burger press or spatula until thin.
Cook for about 2 minutes, until the beef is mostly cooked through.
Carefully lift the tortilla to check doneness, then scrape under the beef with a beveled-edge spatula and flip.
Reduce heat to low and cook another 2–3 minutes, letting the tortilla crisp in the beef fat.
Sprinkle with a little more taco seasoning and top with shredded cheese.
Remove from the griddle and add toppings: shredded lettuce, diced tomato, salsa, and sour cream if desired.