Slice the flank steak into very thin strips against the grain to ensure tenderness.
In a small bowl, combine the chili powder, cumin, garlic powder, sea salt, and black pepper.
Toss the steak strips in the spice mixture until every piece is thoroughly coated.
Heat half of the olive oil in a non-stick skillet over medium-high heat.
Add the sliced bell peppers and onions to the pan, sautéing for 3-4 minutes until they are softened and slightly charred.
Remove the vegetables from the skillet and set aside.
Add the remaining olive oil to the same skillet and sear the steak strips for 2-3 minutes until browned.
Squeeze the juice from the lime over the steak and return the sautéed vegetables to the pan to combine.
Wipe the skillet clean and place the sprouted grain tortilla in the pan over medium heat.
Sprinkle the shredded cheddar cheese over one half of the tortilla, then top with the steak and vegetable mixture.
Fold the tortilla in half and press down firmly with a spatula.
Cook for 2 minutes per side until the tortilla is golden brown and crispy and the cheese has melted.
Remove from the heat, sprinkle with fresh cilantro, and slice into wedges before serving.