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Healthy Low Calorie Sheet Pan Fajita Chicken - Easy, Flavorful, Weeknight-Friendly

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Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings: 4 servings
Ingredients Method

Ingredients
  

  • 1.5 pounds boneless, skinless chicken breasts, thinly sliced
  • 3 bell peppers (mix of red, yellow, and green), thinly sliced
  • 1 large red onion, thinly sliced
  • 2 tablespoons olive oil (or 1 tablespoon olive oil + 1 tablespoon lime juice for lower calories)
  • 1 large lime, juiced (about 2 tablespoons)
  • 3 cloves garlic, minced
  • 1 tablespoon chili powder
  • 1 teaspoon ground cumin
  • 1 teaspoon smoked paprika
  • 1/2 teaspoon dried oregano
  • 1/2 teaspoon kosher salt, plus more to taste
  • 1/4 teaspoon black pepper
  • Optional heat: 1/4 teaspoon cayenne or red pepper flakes
  • Fresh cilantro, chopped, for garnish
  • Optional low-calorie serving ideas: lettuce wraps, low-carb tortillas, cauliflower rice, pico de gallo, extra lime wedges, nonfat Greek yogurt

Method
 

  1. Preheat and prep: Heat your oven to 425°F (220°C). Line a large sheet pan with parchment for easy cleanup.
  2. Slice evenly: Cut chicken into thin strips about 1/2 inch wide. Slice peppers and onion into similar thin strips. Even thickness helps everything cook at the same rate.
  3. Mix the seasoning: In a large bowl, whisk together olive oil, lime juice, garlic, chili powder, cumin, smoked paprika, oregano, salt, pepper, and cayenne if using.
  4. Toss to coat: Add chicken, peppers, and onion to the bowl. Toss well so every piece is coated in the marinade. If you have time, let it sit 10–15 minutes for deeper flavor.
  5. Spread on the pan: Arrange everything in a single layer on the sheet pan. Avoid overcrowding—use two pans if needed for better browning.
  6. Roast: Bake for 16–20 minutes, stirring halfway, until the chicken is cooked through (165°F/74°C) and the veggies are tender with a bit of char on the edges.
  7. Finish and serve: Squeeze extra lime over the pan, sprinkle with cilantro, and taste for salt. Serve with lettuce wraps, low-carb tortillas, or over cauliflower rice. Add pico or a dollop of nonfat Greek yogurt for freshness.