1 tablespoon chili powder
Kosher salt and freshly ground black pepper
1 pound baby bell peppers (12 to 15 peppers), halved, stemmed and seeded
1 large yellow onion, halved and thinly sliced
2 tablespoons extra-virgin olive oil
1 1/2 pounds boneless, skinless chicken breast
Juice of 1 lime, plus lime wedges, for serving
8 fajita-size flour tortillas, warmed
Shredded Monterey Jack cheese, guacamole, hot sauce, salsa and sour cream, for serving