Step 1

Preheat the oven to 425°F and line a large baking sheet with parchment paper.

Step 2

Place the chicken, peppers, onions, garlic and olive oil on the baking sheet.

Step 3

Combine the ingredients for the seasoning in a small bowl, then sprinkle evenly over the chicken and vegetable mixture on the baking sheet.

Step 4

Toss everything together with tongs or your hands to evenly coat. Spread into an even layer.

Step 5

Cook in the preheated oven for 15-20 minutes, tossing once halfway through, until the chicken is cooked through and the vegetables are tender. In the last 5 minutes of cooking, tightly wrap a stack of tortillas in foil and place it on the baking sheet with the fajita mixture to warm them.

Step 6

Serve the fajitas with the warmed tortillas, along with lime juice, cilantro, and sliced avocados, if desired.