Follow these straightforward steps to create your delicious Sheet Pan Steak Fajitas:

1. Preheat the Oven: Set your oven to 400°F (200°C) to prepare for cooking.
2. Prepare the Steak: Slice the flank steak into thin strips against the grain, ensuring tenderness.
3. Season the Steak: In a mixing bowl, combine olive oil, chili powder, cumin, garlic powder, onion powder, smoked paprika, salt, and black pepper. Add the steak strips to the bowl and toss to coat evenly.
4. Arrange on Sheet Pan: Spread the seasoned steak evenly on one side of a large sheet pan.
5. Add Vegetables: On the other side of the sheet pan, arrange the sliced bell peppers and onion. Drizzle with olive oil and sprinkle with salt and pepper. Toss them to ensure even coverage.
6. Bake in the Oven: Place the sheet pan in the preheated oven and bake for 20-25 minutes or until the steak reaches your desired doneness, and the vegetables are tender.
7. Finish Off: Remove the pan from the oven and drizzle lime juice over the steak and vegetables for an extra punch of flavor.
8. Garnish: Sprinkle freshly chopped cilantro on top for presentation and added flavor.
9. Warm Tortillas: Meanwhile, warm the tortillas in a separate pan or directly on the oven rack for a couple of minutes to soften.

With these easy steps, your Sheet Pan Steak Fajitas are all set to be served!