Sheet Pan Chicken Fajitas Recipe with Peppers and Onions

These sheet pan chicken fajitas are an easy, flavor-packed weeknight dinner. Tender, seasoned chicken is roasted alongside bell peppers and onions so everything caramelizes together and cleanup is minimal. Ready in under 45 minutes, this recipe is flexible: swap vegetables, change the heat level, or top with your favorite garnishes.

I’m a fan of simple, one-pan Mexican-style dinners. These baked chicken fajitas join other easy favorites like slow cooker chicken tacos, an Instant Pot chicken burrito bowl, and grilled chicken tacos. With minimal chopping—mainly peppers and onions—you can toss everything on a baking sheet and let the oven do the work.

This method is ideal for busy evenings when you want something satisfying without much fuss. Leftovers reheat well and make great lunches, or you can fold them into a wrap for a quick, portable meal.

What Makes These Fajitas Unique

• Customizable: Use whichever peppers or seasonal vegetables you prefer.
• Fresh seasoning: A homemade fajita blend gives brighter, fresher flavor than pre-mixed packets.
• Minimal cleanup: Roasting everything together keeps dishes to a minimum and concentrates flavor.

Ingredient Notes

• Chicken breasts: Lean and mild, they take on the spices well. Cut into uniform strips so they cook evenly.
• Bell peppers: A mix of colors adds sweetness and visual appeal. Any color combination works.
• White onion: Thin slices caramelize in the oven and balance the peppers with a subtle bite.
• Spices: The seasoning is mostly pantry spices—chili powder, cumin, paprika, garlic powder, oregano, salt and pepper. A store-bought fajita mix is a fine shortcut if you prefer.
• Olive oil: Coats the chicken and vegetables so they roast evenly and develop crisp edges.

The full ingredient list and quantities appear in the recipe card below.

Ingredient Swaps

Feel free to adapt the recipe to what you have on hand:

• Use chicken thighs instead of breasts for richer flavor and extra juiciness.
• Substitute poblano peppers or zucchini for bell peppers to vary texture and flavor.
• Try red onion in place of white onion for a sweeter, more colorful result.
• If you prefer, swap olive oil for avocado oil for a higher smoke point.
• Top with cheddar, Monterey Jack, or a dairy-free cheese depending on dietary needs.

How to Make Sheet Pan Chicken Fajitas

Full ingredient amounts and step-by-step instructions are also listed in the recipe card below.

Step 1: Preheat the oven to 425°F. In a large bowl, toss sliced peppers and onions with 1 tablespoon olive oil, then season with salt and pepper. Spread the vegetables in a single layer on one side of a large baking sheet.

Step 2: In the same bowl, toss the chicken strips with the chili powder, cumin, paprika, garlic powder, oregano, salt, black pepper and the remaining 2 tablespoons of olive oil. Spread the seasoned chicken on the opposite side of the baking sheet.

Tip: Cut the chicken and vegetables into pieces that are similar in thickness so everything cooks evenly.

Step 3: Roast for 25–30 minutes at 425°F, until the chicken is browned and the peppers begin to char.

Step 4: Remove from the oven, stir in chopped cilantro, and serve the chicken and veggies on warm tortillas with avocado, shredded cheese, and a squeeze of lime if you like.

Chicken Fajita Stovetop Option

If you prefer stovetop cooking, heat a large skillet over medium-high heat. Cook seasoned chicken for 3–4 minutes per side until done, remove it, then cook the peppers and onions 5–7 minutes until they begin to char. Return the chicken to the pan to warm through and serve immediately.

An Instant Pot or slow cooker version also works well for hands-off cooking.

Recipe FAQs

Storage and Reheating

• Refrigerate leftovers in an airtight container for 3–4 days. Reheated fajitas make excellent wraps, quesadillas, or nachos.
• For longer storage, freeze cooked chicken and vegetables for up to 2 months. Thaw overnight in the refrigerator before reheating.
• Reheat in a 350°F oven for 10–15 minutes, or warm in a skillet over medium heat until heated through.

Pro Tips / Recipe Notes

• If you don’t want to make your own seasoning, a good store-bought fajita mix works just fine.
• There’s no need to line the baking sheet; the chicken and vegetables release easily once roasted.
• Slice everything to a similar thickness so ingredients finish cooking at the same time.
• Toss the pan halfway through baking to promote even charring.
• For extra char, finish under the broiler for 2–3 minutes—watch closely so nothing burns.
• To make flour tortillas pliable, warm them 30 seconds per side in a skillet or microwave them covered with a damp paper towel for 30 seconds.

Other Recommended Taco Recipes

If you’ve tried these sheet pan chicken fajitas or any other recipe on Chisel & Fork, please let me know how it turned out in the comments below. For a vegetarian take, try sweet potato fajitas.

Sheet Pan Chicken Fajitas