Dinner · Part 2 of 3: Instructions
Easy Sheet Pan Chicken Fajitas for a Quick Dinner Step-by-step instructions

- Prep
- Cook
- Total
- Serves
- 4
Before you start
Before you begin, ensure your oven is fully preheated to 400°F (200°C), as this high heat is critical for achieving the right texture. Have your sheet pan lined with foil and ready on your counter.
Wash and dry your peppers thoroughly, and prepare all your ingredients by slicing them into thin, consistent strips. Having everything prepped before you start mixing ensures the process remains smooth and efficient, allowing you to get the pan into the oven without delay.
Ingredients at a glance (4)
- 1 1/2 lb boneless skinless chicken breasts, sliced into strips
- 3 large bell peppers (red and green), sliced
- 1 large yellow onion, sliced into strips
- 1 tbsp fajita seasoning
Instructions
Preparation and Slicing
- Prepare the IngredientsPreheat the oven to 400°F (200°C). Line a large sheet pan with aluminum foil for easy cleanup. Slice the chicken breasts into uniform strips, then slice the bell peppers and yellow onion into strips of similar width to ensure even cooking.Look for Vegetables and chicken should be cut into thin, uniform strips.Tip Keeping the strips consistent in size ensures everything roasts at the same rate.
The chicken, peppers, and onions are sliced into uniform strips. Everything is ready on the cutting board, the oven is at 400°F (200°C), and the sheet pan is lined with foil, prepared for the seasoning stage.
Seasoning and Spreading
- Season and RoastPlace the sliced chicken, peppers, and onions onto the prepared sheet pan. Sprinkle the fajita seasoning over everything. Toss well with your hands or tongs to ensure every piece is coated. Spread the mixture in a single, even layer across the pan.Look for Everything is evenly coated in spices.Tip Do not overcrowd the pan, as this leads to steaming rather than roasting.
The chicken and vegetables are tossed with fajita seasoning until uniformly coated. The mixture is spread in a single, even layer across the pan, ensuring no pieces are piled on top of each other.
Roasting and Serving
- Bake and ServePlace the pan in the oven and roast for about 20 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (74°C). The peppers and onions should be tender and slightly charred. Remove from the oven and let rest for 5 minutes before serving.Look for Chicken is opaque and juices run clear; vegetables are soft with charred edges.Safe temperature 165°F (74°C) internal temperature (poultry)Tip Use a meat thermometer to ensure the chicken is perfectly cooked.
The chicken has reached 165°F (74°C), the vegetables are tender with charred edges, and the kitchen smells savory and fragrant. Everything is ready to be transferred to plates for serving.
Common mistakes
A common mistake is overcrowding the sheet pan, which causes the ingredients to steam rather than roast, preventing that desirable char. Ensure there is enough space between the pieces.
Another error is failing to preheat the oven completely; starting in a cool oven will result in rubbery chicken.
Finally, do not overcook the vegetables; they should be tender but still retain a bit of structure, so keep an eye on them during the final minutes of the roasting process.
How to tell it’s done
The chicken is done when it is opaque throughout and reaches a safe internal temperature of 165°F (74°C). You can verify this by inserting an instant-read thermometer into the thickest part of a chicken strip.
The peppers and onions should be soft and exhibit some charred, caramelized edges, which indicates that they have roasted sufficiently to develop their natural sweetness. Allow the dish to rest for 5 minutes after removing it from the oven to ensure the juices redistribute.
- Poultry: 165°F (74°C) in the thickest part
Up next · Part 3 of 3
2 variations · storage & make-ahead · 3 answers · printable card
Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)