How to Make Baked Chicken Fajitas

Step 1 - Mix the spice blend and marinate: In a large bowl, whisk together the olive oil, lime juice and zest, smoked paprika, cumin, chili powder, garlic powder, onion powder, oregano, cayenne, salt, and pepper until fully combined. Add the sliced chicken, peppers, and onion and toss everything together thoroughly so every piece is evenly coated in the spiced oil. If you have time, let this sit at room temperature for 20 to 30 minutes so the acid and spices begin to work into the surface of the chicken — even this short marinating window produces noticeably more flavorful results than going straight to the oven.

Step 2 - Preheat and prepare the pan: Preheat the oven to 425 degrees Fahrenheit and line a large rimmed sheet pan or 9x13-inch baking dish with foil for easier cleanup. The foil lining is optional but makes the difference between a five-minute cleanup and a twenty-minute one. If you want maximum caramelization on the vegetables, skip the foil and use a bare metal sheet pan — direct contact with the hot metal produces more browning at the edges of the peppers and onions than foil does.

Step 3 - Spread and bake: Spread the marinated chicken and vegetables across the prepared pan in a single layer, taking care not to pile or overlap pieces — crowding the pan causes the ingredients to steam in their released moisture rather than roast in dry heat, which eliminates the caramelization and produces a pallid, wet result instead of the lightly charred edges that make oven fajitas taste like they were cooked over actual heat. Bake at 425 degrees for 20 to 25 minutes, stirring once at the halfway point to redistribute the juices and expose new surfaces to direct heat.

Step 4 - Check for doneness and rest briefly: The chicken is done when it reads 165 degrees Fahrenheit on an instant-read thermometer and shows no pink at the thickest point when a strip is cut open. The peppers should be tender with slightly caramelized edges, and the onions should be translucent and soft throughout. Remove the pan from the oven and let it rest for 3 to 4 minutes before serving — this brief rest allows the juices released during cooking to redistribute back into the chicken rather than running out immediately when the tortilla is filled, keeping the filling moist rather than dry.

Step 5 - Warm the tortillas and serve: While the fajita filling rests, warm the tortillas in a dry skillet over medium heat for about fifteen seconds per side, or wrap them in a damp paper towel and microwave for thirty seconds. Bring the pan to the table and let everyone fill their own tortillas with chicken, peppers, and onions, then top with sour cream, shredded cheese, guacamole, salsa, pickled jalapeños, and fresh cilantro according to preference. The communal serving format is part of what makes this recipe work so well for family dinners — the cooking is done entirely in the kitchen, and the table becomes the assembly station.