In a large bowl, whisk together the avocado oil, soy sauce, vinegar, lime juice, cumin, smoked paprika, oregano, garlic powder, cayenne, salt, and pepper until well combined.
Add the steaks to the bowl and make sure they’re well coated in the marinade. Cover with plastic wrap and pop it in the fridge for at least 30 minutes—longer if you’ve got the time. The longer it sits, the more flavorful it gets.
Once you're ready to cook, preheat your oven to 400°F/200°C. Heat a large oven-safe skillet over medium-high heat on the stovetop, add a tablespoon of oil, and sear the steaks for 5–7 minutes per side, until nicely browned with crispy edges. Then transfer the skillet to the oven and roast for another 8–10 minutes, or until cooked to your liking.
Pull the skillet from the oven and let the steak rest on a cutting board for about 15 minutes before slicing it into thin strips. While it rests, get your bread and toppings ready.
Slice your bread open, lay down the cheese, and pop it in the oven at 350°F/175°C for 6–8 minutes until the cheese is melted and bubbly.
Now it’s time to build your torta—pile on the sliced steak, guac, tomatoes, red onion, lettuce, cilantro, and jalapeños. Serve it up while it’s hot and dig in!