Preheat oven to 425F (use Convection if you have it), line half sheet pan with foil for easier cleanup if desired, and add the chicken, peppers, and onions.
Evenly drizzle with the olive oil, and evenly sprinkle the chili powder, cumin, Mexican oregano, smoked paprika, garlic powder, salt, and pepper, then toss to evenly coat.
Bake for about 20 to 25 minutes. Midway through cooking, stir the ingredients and rotate the pan to ensure even cooking.
Optionally garnish with cilantro, lime juice, add filling mixture to the tortillas, and serve immediately.
Recipe will keep airtight in the fridge for up to 5 days.