Preheat the Oven:
Set your oven to 400°F (200°C). Line a sheet pan with parchment paper (trust me, it’s a lifesaver).
Prep the Chicken & Veggies:
Slice chicken into strips.
Slice bell peppers and onion.
Season Everything:
In a large bowl, toss chicken, peppers, and onions with olive oil, spices, and lime juice. Mix until everything’s coated.
Spread on the Pan:
Arrange chicken and veggies in a single layer on the sheet pan. (Don’t overcrowd—this is key!)
Bake:
Roast for 20-25 minutes, flipping halfway through, until chicken is cooked and veggies are slightly charred.
Finish & Serve:
Squeeze fresh lime juice over the fajitas.
Warm tortillas, fill with chicken and veggies, and top with cheese, sour cream, avocado, and cilantro.