Preheat the oven to 400°F (200°C). Line a rimmed sheet pan with aluminum foil or a silicone baking sheet.
Slice the peppers, onion, and zucchini into bite-sized strips. If using chicken breast, slice the chicken breast into smaller pieces. Transfer to the baking sheet.
Season the chicken, peppers, and zucchini with the seasonings listed above, the oil, and the juice of 1 lime.
Roast in the preheated oven, stirring halfway through, until chicken is no longer pink and bell peppers soften, 20-25 minutes.
Garnish with cilantro and squeeze remaining lime onto the finished dish. Serve with rice, warm tortillas, and enjoy!