Preheat your oven to 400°F (200°C). Line a large sheet pan with parchment paper for easy cleanup.
In a large bowl, combine the chicken strips, sliced bell peppers, and sliced onion.
1.5 lbs boneless, skinless chicken breasts, 1 large red bell pepper, 1 large green bell pepper, 1 large yellow onion
Drizzle the olive oil over the chicken and veggies. Sprinkle with fajita seasoning (either from a packet or your homemade blend). Mix well to ensure everything is evenly coated.
2 tablespoons olive oil, 1 packet fajita seasoning
Spread the mixture in a single layer on the prepared sheet pan.
Bake for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender-crisp.
While the fajitas are baking, warm your tortillas according to package directions.
Flour or corn tortillas
Serve the Sheet Pan Chicken Fajitas immediately in warm tortillas with your favorite toppings. Enjoy!
Flour or corn tortillas, Optional toppings: sour cream, guacamole, salsa, shredded cheese, cilantro, lime wedges