Sheet Pan Party Fajitas

Name: Sheet Pan Party Fajitas
Ingredients: 2 tablespoons chili powder; Kosher salt and freshly ground black pepper; 1 1/2 pounds baby bell peppers (12 to 15 peppers), halved, stemmed and seeded; 1 large yellow onion, halved and thinly sliced; 3 tablespoons extra-virgin olive oil; 10 ounces boneless, skinless chicken breasts, cut into thin strips; 10 ounces strip steak, cut into thin strips (see Cook's Note); 10 ounces peeled and deveined medium shrimp, tails removed; Juice of 1 lime, plus lime wedges, for serving; 16 flour tortillas, warmed; Shredded Monterey Jack cheese, guacamole, hot sauce, salsa and sour cream, for serving