Slice the steak into thin strips and season evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Thinly slice the red bell pepper and yellow onion into strips.
Heat the avocado oil in a large stainless steel or cast iron skillet over medium-high heat until shimmering.
Add the steak strips to the hot pan in a single layer and sear for 2-3 minutes until a brown crust forms, then remove from the pan and set aside.
In the same skillet, add the peppers and onions, sautéing for 4-5 minutes until they are tender and slightly charred.
Wipe the skillet clean with a paper towel and return to medium heat.
Place the tortilla in the skillet and sprinkle half of the cheese over one side.
Layer the seared steak and sautéed vegetables over the cheese, then top with the remaining cheese.
Fold the tortilla over the filling and press down with a spatula, cooking for 2-3 minutes per side until the tortilla is golden brown and the cheese is fully melted.
Remove from the heat, let rest for one minute, and slice into wedges.