Preheat oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Slice the chicken breast, bell peppers, and red onion into thin, uniform strips.
Place the chicken and vegetables on the sheet pan, drizzle with olive oil, and sprinkle with chili powder, cumin, paprika, garlic powder, salt, and pepper.
Toss everything together until the ingredients are thoroughly and evenly coated, then spread into a single layer.
Roast for 18-20 minutes until the chicken is cooked through and the vegetables are slightly charred.
Remove from the oven, drizzle with fresh lime juice, and garnish with chopped cilantro.
Serve the sizzling mixture immediately inside warm corn tortillas.