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sheet pan fajitas

Sheet Pan Chicken Fajitas

5 from 1 vote
These easy sheet pan fajitas are made with juicy chicken thighs, sweet roasted peppers, and one pan — just 15 minutes of hands-on prep!
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Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings: 4 servings
Course: Main Course
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

For the Chicken
  • 6 boneless skinless chicken thighs — thighs are the secret to juicy fajitas; they stay tender at 400°F where breast strips dry out
  • ½ teaspoon salt
  • 1 teaspoon garlic powder
  • 1 teaspoon smoked paprika — the smoky backbone of this recipe; regular paprika works but smoked is worth it!
  • 1 teaspoon parsley flakes
  • ½ teaspoon ground black pepper
  • 4 tablespoons olive oil
For the Veggies
  • 3 bell peppers sliced into ½-inch strips — I use red, yellow, and orange for the sweetest flavor and prettiest pan
  • 1 large red onion sliced into ¼-inch strips — red onion turns sweet and jammy in the oven
  • 1 teaspoon salt
  • 1 teaspoon garlic powder
  • 1 teaspoon smoked paprika
  • 1 teaspoon parsley flakes
  • 4 tablespoons olive oil
To Serve
  • Flour tortillas warmed
  • Spicy mayonnaise — this is the move that makes these fajitas mine; the creamy heat with the smoky chicken is unreal
  • Fresh guacamole

Equipment

Method
 

  1. Preheat the Oven: Preheat your oven to 400°F (200°C). Line your largest rimmed baking sheet with parchment paper — this is what makes cleanup basically nonexistent.
  2. Marinate the Chicken: In a bowl or a resealable plastic bag, combine the chicken thighs with the salt, garlic powder, smoked paprika, parsley flakes, black pepper, and olive oil. Massage everything together so every thigh is evenly coated, then let it marinate for at least 15 minutes while you prep the veggies. (WATCH VIDEO BELOW)
  3. Prep the Veggies: Slice the bell peppers into ½-inch strips and the red onion into ¼-inch strips. In a separate bowl, toss them with the salt, garlic powder, smoked paprika, parsley flakes, and olive oil until every strip is glistening.
  4. Assemble on the Sheet Pan: Spread the seasoned veggies and chicken evenly across the baking sheet in a single layer. Give everything room to breathe — a crowded pan steams instead of roasts, and we want those caramelized edges! (WATCH VIDEO BELOW)
  5. Bake: Transfer the sheet pan to the oven and bake for 30 minutes covered with tinfoil, until the chicken is cooked through (165°F / 74°C on a thermometer) and the veggies are tender with lightly charred, caramelized edges. Broil uncovered at 450F for 10 more minutes!
  6. Rest, Slice, and Serve: Let everything rest for a few minutes — this keeps the chicken juicy. Slice the thighs into strips, then pile everything into warm tortillas with a drizzle of spicy mayo and a big scoop of fresh guacamole. (WATCH VIDEO BELOW)
  7. How I build mine: warm tortilla, a swipe of guacamole first (it anchors everything!), then chicken, then a tangle of those sweet roasted peppers and onions, and a generous zigzag of spicy mayo over the top. Set the whole sheet pan in the middle of the table and let everyone assemble their own — it's the easiest way to feed a crowd without cooking to order.
    8. Give everything room. Use your largest sheet pan and keep everything in a single layer — a crowded pan traps steam, and steamed fajitas are sad fajitas. If it looks packed, split it across two pans
    Keep the thighs whole. This is the tip I swear by. Whole thighs baste themselves in the oven and get sliced after baking — pre-sliced strips lose their juices before they ever hit the tortilla.
    Marinate while you slice. The 20-minute marinade happens during veggie prep, so it adds zero extra time. Efficient and flavorful — my favorite combo!

Notes

Storage:
  • Fridge: Store leftovers in an airtight container for 3–4 days. The chicken and veggies can be stored together.
  • Reheat: A skillet over medium heat with a tiny drizzle of oil is best — it brings back those caramelized edges. The microwave (60–90 seconds) totally works for weekday lunches, too.
  • Freezer: Avoid freezing the cooked fajitas — the peppers and onions turn watery once thawed. If you want a freezer meal, freeze the raw, seasoned chicken and sliced veggies in a bag for up to 2 months, thaw overnight in the fridge, and bake as written.
Meal prep it! Double everything across two sheet pans on Sunday and you've got lunches sorted:
  1. Fajita bowls — over rice with extra guac
  2. Fajita wraps — rolled up tight for grab-and-go lunches

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