1Heat the oven to 450 F and line a rimmed sheet pan with foil.
2Toss the steak with 1 tbsp of the oil, the lime juice, and half the seasoning packet. Let it sit while you prep the vegetables.
3Toss the peppers and onion with the remaining 2 tbsp oil and the rest of the seasoning. Spread on the sheet pan and roast 10 minutes.
4Push the vegetables aside, lay the steak in the center in one layer, and roast 6 to 8 minutes until browned at the edges.
5Rest the steak 3 minutes, then slice any thick pieces. Toss with the vegetables, season with salt to taste, and serve in warm tortillas with cheese, cilantro, and lime wedges.