Sheet-Pan Chicken Fajitas the Whole Family Can Build

Sheet-pan chicken fajitas give you a hands-off weeknight dinner: slice chicken, peppers and onion, toss them with a mild spice mix, roast everything on one pan, and set out tortillas and toppings so everyone builds their own. The spice mix has no chili heat, so the kids' version and the adults' version come off the same pan, and adults add hot sauce at the table.

Serves: 4 (2 fajitas each) · Prep: 15 minutes · Cook: 20–25 minutes · Kid-friendly: very. It's mild, and kids choose their own fillings.

Ingredients

For the pan:

• 1 1/2 lb (680 g) boneless, skinless chicken breasts or thighs
• 3 bell peppers in mixed colours, about 1 lb (450 g) total
• 1 medium onion, about 5 oz (150 g)
• 3 tbsp (45 ml) olive oil
• 1 lime

For the mild spice mix:

• 2 tsp (10 ml) sweet paprika
• 1 1/2 tsp (7.5 ml) ground cumin
• 1 tsp (5 ml) garlic powder
• 1 tsp (5 ml) dried oregano
• 3/4 tsp (4 ml) salt
• Optional for adults: 1/2 tsp (2.5 ml) chili powder or a pinch of cayenne, sprinkled over one end of the pan only

To serve:

• 8 small flour tortillas, 6 inch (15 cm)
• 1 cup (100 g) shredded cheddar or Monterey Jack
• 1/2 cup (120 ml) sour cream or plain yogurt
• 1 ripe avocado, sliced
• 1 cup (150 g) diced tomatoes
• 2 cups (100 g) shredded lettuce

Thighs stay juicier if they cook a few minutes too long. Breasts are leaner and slice more neatly. Both work.

How to make it

1. Heat the oven to 425°F (220°C). Line a large rimmed baking sheet, about 18 x 13 inches (46 x 33 cm), with parchment for easier cleanup.
2. Slice the chicken into strips about 1/2 inch (1 cm) thick. Use a separate board from the one you'll use for vegetables, and wash your hands after handling raw chicken.
3. Slice the peppers and onion into strips about the same thickness, so everything cooks at the same pace. If cutting the onion makes your eyes sting, chilling it for 30 minutes and using a sharp knife help, and here's why onions make you cry in the first place.
4. Stir the spice mix together in a small bowl. Put the chicken and vegetables on the pan, drizzle with the oil, sprinkle over the spice mix, and toss with your hands or tongs until everything is coated.
5. Spread it all out in a single layer (see below), then roast for 20–25 minutes, stirring once halfway.
6. Check the chicken with an instant-read thermometer in the thickest strip. It's done at 165°F (74°C), the USDA safe minimum for poultry.
7. While it roasts, wrap the tortillas in foil and warm them in the oven for the last 5–10 minutes.
8. Squeeze half the lime over the pan, cut the other half into wedges, and bring the pan to the table with the toppings.

Give everything room on the pan

The single most important step is spreading the strips out. When they touch or pile up, the moisture they release has nowhere to go, so they steam in their own juices and come out pale and soft. With space around each strip, the hot air dries the surface and the edges brown.

If your pan is smaller than the size above, use two pans on two racks and swap them halfway through.

The build-your-own table

Put the pan in the middle of the table with tortillas and toppings around it. Kids who like their food separate can have the chicken, peppers and tortilla side by side on the plate. That still counts as fajita night. Kids who like to build can fill and roll their own, and adults can add hot sauce, pickled jalapeños or salsa.

Adjusting it for younger kids

For children under 4, food that's firm, round or hard to chew is a choking risk, so:

• Cut the chicken into small, thin pieces across the grain.
• Make sure the peppers and onion are roasted until very soft, and chop them small. Leave raw pepper strips off their plates.
• Cut the avocado into small soft pieces and the tomato into small dice.
• Tear the tortilla into small pieces rather than rolling a fat fajita.

Older kids can help. Ages 4–7 can mix the spice blend, tear lettuce and fill topping bowls. Ages 8–12 can toss the vegetables in oil and spices and set the table. An adult should handle the raw chicken, sharp knives and the hot oven. For a fuller list of kitchen jobs by age, see our homemade pizza you can make with kids.

Allergen swaps

• Gluten (flour tortillas): use corn tortillas, and check the label to make sure they're made without wheat. Lettuce leaves work as wraps too.
• Dairy (cheese, sour cream): leave them off, or use dairy-free versions. Mashed avocado with lime works in place of sour cream.
• Spice blends: if you use a ready-made fajita seasoning instead of the mix above, check the label, since some contain wheat, milk or soy.
• The recipe has no nuts, eggs, sesame or shellfish.

Storing and reheating

Refrigerate leftovers within 2 hours in a covered container and eat them within 3–4 days, following USDA guidance on cooked leftovers. Store the chicken and vegetables apart from the tortillas and cold toppings.

Reheat the chicken and vegetables in a skillet over medium heat or in the microwave until steaming hot, 165°F (74°C), all the way through. Leftover fajita chicken also makes a great topping for a baked potato bar night, or you can fold it into quesadillas the next day.