These Sheet Pan Keto Chicken Fajitas are a simple and delicious meal the entire family will love. Serve in a bowl with cauliflower rice, salsa, and guacamole for Whole30, or serve in some grain free tortillas for taco night! Gluten free, dairy free, Keto, and grain free. 

This post was originally published on Dec 16, 2017 and was updated with new photos & copy on November 19, 2021!

Sheet pan chicken fajitas

I could eat Mexican food every single day and it would never get old. If you’re looking for easy chicken fajita recipes, look no further! This is one dinner that I can make and it will be a hit with the kiddos, too. Yay for not having to cook multiple meals! These low carb chicken fajitas are the easiest, one-pan dish you can make. The homemade Keto fajita mix is a much healthier alternative to the additive-filled packets! This recipe is also perfect for making fajitas for a crowd.

Ingredients for Easy Sheet Pan Keto Fajitas

See the recipe card for full quantities – this is just an overview!

  • Avocado oil (I like to use this because of the high heat point, but regular olive oil works, too!)
  • red bell pepper
  • orange bell pepper
  • green bell pepper
  • medium onion
  • 1.5 lbs chicken breasts – I love to get organic chicken breasts from Butcher Box!

Ingredients for easy sheet pan chicken fajitas

The best part is the Easy Homemade Paleo Fajita Seasoning Mix! Many of the seasoning packets you find in stores have gluten, MSG, and lots of additives. This is an easy and cost-effective alternative! You can triple the amounts used in this recipe and store the extra seasoning mix for future use. Here is what you need:

  • Cumin
  • Chili powder
  • Garlic powder
  • Paprika
  • Oregano
  • Salt
  • Red pepper flakes

This mixture also makes a great homemade taco seasoning!

Homemade fajita spice mix

How to make One Pan Fajitas:

Making fajitas in the oven has never been easily. No stovetop splattering or mess to clean up!

Preheat your oven to 400 degrees. Slice the peppers, onions, and chicken into thin strips (about 1/4-1/2 inch wide). Make sure the chicken pieces are of even thickness to prevent uneven cooking. This also helps them to crisp up. When everything is piled on top of each other, they end up steaming instead of baking. Spacing everything out as much as possible is key!

Put the peppers and chicken strips into a a large bowl and add the avocado oil and spices. Mix it all together and spread it out evenly on a parchment-lined baking sheet.

Bake for 25-30 minutes until everything is cooked through and beginning to brown.

How To Serve Paleo Fajitas

For gluten free, serve in corn tortillas. For paleo, use grain free tortillas or to make this Whole30 friendly, serve on a salad/in a bowl with cauliflower rice, avocado, salsa, and dairy free ranch! The options are endless when it comes to putting together your own healthy fajita bowl.


Are these fajitas Keto? They are! With only 9 grams of carbs per serving, this meal is definitely low carb diet-friendly.

Are fajitas Whole30 compliant? These are! All of the ingredients used here are Whole30 friendly.

What size sheet pan should I use? I love to use this 15 x 21 inch sheet pan for all of my recipes. It’s big enough so everything is spread out and not overlapping, which gets them nice and crispy!

Are fajitas gluten free? Yes, this fajita recipe is gluten free, dairy free, and paleo.

Can you freeze chicken fajitas? Sure can! To freeze, place the chicken, veggie, & spice/oil mixture into a gallon freezer bag. Seal the ziplock bag, squeezing out as much of the air as you can as you do so. The day before you’d like to cook the fajitas, move the bag to the fridge to thaw.

How many calories in chicken fajitas? Just 268 calories per serving!

Healthy baked chicken fajita bowl

If you try these Chicken Fajitas, make sure to tag me on Instagram @maryswholelife so I can see your creations!

Looking for some other yummy healthy Mexican-inspired recipes? Check these out:

Paleo Huevos Rancheros

Whole30 Taco Stuffed Peppers

Paleo Watermelon Margaritas

Happy cooking!


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Sheet Pan Chicken Fajitas

An easy, Whole30 compliant, one pan meal the whole family will enjoy!
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  • 3 tbsp avocado oil
  • 1 red bell pepper
  • 1 orange (or yellow) bell pepper
  • 1 green bell pepper
  • 1 medium onion
  • 1-1.5 lbs chicken breasts
  • 1.5 tsp cumin
  • 2 tsp chili powder
  • 1 tsp garlic powder
  • 1 tsp paprika
  • ½ tsp oregano
  • 1 tsp sea salt
  • ½ tsp black pepper
  • ½ tsp red pepper flakes


  • Preheat your oven to 400 degrees. Slice the peppers, onion, and chicken into thin strips (about 1/4-1/2 inch wide). Make sure the chicken pieces are of even thickness to prevent uneven cooking.
  • Put these pieces into a large bowl and add the avocado oil and spices. Mix together and spread out evenly on a parchment lined rimmed baking sheet.
  • Bake for 25-30 mins until cooked through and beginning to brown. Serve in tortillas, on top of a salad, or in a rice bowl with your favorite toppings. Enjoy!


These chicken fajitas can be stored in an air-tight container in the fridge for up to 4 days. Reheat in a pan on the stove or in the microwave.


Calories: 268kcal, Carbohydrates: 9g, Protein: 26g, Fat: 14g, Saturated Fat: 2g, Trans Fat: 1g, Cholesterol: 73mg, Sodium: 740mg, Potassium: 693mg, Fiber: 3g, Sugar: 5g, Vitamin A: 2432IU, Vitamin C: 105mg, Calcium: 36mg, Iron: 2mg