01 - Heat oven to 425°F. Line a large baking sheet with parchment paper or foil.
02 - Combine steak strips with olive oil, lime juice, chili powder, cumin, smoked paprika, garlic powder, onion powder, salt, and pepper in a large bowl. Toss to coat evenly and let rest for 10 minutes, or refrigerate up to 1 hour for stronger flavor.
03 - In a separate bowl, toss bell peppers and red onion with olive oil, salt, and pepper until evenly coated.
04 - Arrange the vegetables evenly on the prepared baking sheet, then place marinated steak strips over the top in a single layer.
05 - Cook in the preheated oven for 15 to 20 minutes, stirring once halfway through, until steak reaches preferred doneness and vegetables are tender with slight charring.
06 - Remove from oven and serve immediately with warm tortillas and toppings such as cilantro, lime wedges, avocado, and sour cream as desired.