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This low carb chicken fajita casserole is a flavorful, cheesy, protein packed meal the entire family will enjoy. It’s an easy weeknight dinner that’s low carb, gluten free, and perfect for keto and THM.
Everyone loves creamy, cheesy dinners. They’re satisfying, decadent, and delicious. That’s why low carb casseroles are a fantastic family dinner enjoyed by all - even those who aren’t following a low carb or keto diet.
This low carb fajita casserole is about to become one of your family’s favorite healthy chicken casserole recipes. With healthy veggies, protein packed chicken and dairy, and the melty decadence of cream cheese and melted monterey jack, even the kids will be begging for more.
Ingredients For Low Carb Chicken Fajita Casserole
One of the best things about a simple casserole dinner is how few ingredients they need to come together. This one has only 7 ingredients and yet it’s full of Tex-Mex taste.
- Chicken breasts
- Coconut oil, optional
- Bell peppers
- Cream cheese
- Taco seasoning
- Monterey jack cheese, shredded
If you want to jazz up this recipe and make it more colorful, you can use a rainbow of bell peppers, instead of just the traditional green. Bell peppers bring color and a variety of flavor to your dish, as well as lots of Vitamin C and other nutrients.
You can also add some green chiles or jalapeños if you want to turn up the heat. Sprinkle them on top at the end, or bake them to make it even spicier. Other fun add ons would be black olives, diced avocado, or diced tomatoes.
How To Make Your Keto Chicken Fajita Casserole
This is a 2 dish dinner, which makes for very easy clean up.
In a skillet, saute your onions and peppers to soften them and release their flavor. Coat the skillet with your choice of oil.
Once they are soft, remove the skillet from the heat.
Next, add your chicken, cream cheese, seasoning, and part of your shredded cheese. Combine the ingredients with the onions and peppers in the warm skillet.
Once it’s all creamy and melty, transfer it to a greased baking dish. Sprinkle the remaining cheese on top and bake until the cheese is bubbly, which will be 25-30 minutes.
How To Prep And Serve Your Easy Chicken Casserole
One of my time saving kitchen tricks is to make shredded chicken in batches and then keep it frozen and ready to pull out to use in our favorite healthy chicken recipes.
It’s also easy to have bags of sliced onions and peppers in your freezer or prepped weekly in the fridge for easy grab-and-go cooking.
Make Ahead Fajita Casserole
You can assemble the casserole and serve when ready if you’d like, skipping the skillet step and using chunks of cream cheese.
The texture will be a little different, but you can do this to save time if you need to.
Simply leave off the shredded cheese on top so you can stir the ingredients together in the baking dish about 15 minutes into your cooking time to combine them, then add it for the last part of the baking.
Making Chicken Fajita Casserole In The Crockpot
This could also be made in a crockpot - layer all the ingredients as you would to bake in the oven, then cook on low for 2-3 hours, depending on your slow cooker.
You could start it before picking up the kids from school and have it ready by dinner time! What a simple way to make dinner.
Serving Keto Fajita Casserole
You can serve this as is or pair it with your favorite side dish.
It’s great with cilantro lime cauliflower rice for a fun south-of-the-border rice bowl.
You can also make southwest salad (and just leave off the chicken since it’s in the casserole) for a side. (To keep the salad keto just omit the black bean/corn salsa.)
Low carb tortilla chips and avocado salsa also make for a great pairing.
It’s delicious wrapped up in a low carb tortilla or served up in a lettuce boat, too. This is a very versatile recipe for dinner or made up to enjoy as tacos, burritos, or a salad topping for lunch all week long.
If you have leftovers of the casserole, they can be frozen or kept in an airtight container in the fridge for up to a week. When you reheat it, just sprinkle a couple of drops of water in the dish and loosely cover before microwaving to help the cheese get melty. Alternately, you can heat it back up in the oven.
Chicken Fajita Casserole
This low-carb chicken fajita casserole is a flavorful, cheesy, protein packed meal the entire family will enjoy. It’s an easy weeknight dinner that’s low-carb, gluten-free, and perfect for keto and THM.
- 2 lbs. Chicken Breasts, cooked and shredded (about 3.5 - 4 cups)
- 1 Tablespoon Coconut Oil, optional
- 2 Bell peppers, eeded and sliced
- 1 Large or 2 Small Onion, sliced
- 1 (8 ounce) Package Cream Cheese, softened
- 1 Tablespoon Taco Seasoning
- 2 Cups Shredded Monterey Jack Cheese
- Preheat oven to 350 degrees.
- Prepare a 9x13 casserole dish with coconut oil cooking spray.
- In a large skillet over medium-high heat, add coconut oil and swirl to coat.
- Add onions and peppers to skillet, cooking over medium-high heat and stirring occasionally until softened. Remove from heat.
- To the skillet, add shredded chicken, cream cheese, taco seasoning, and 1 cup cheese. Stir to combine.
- Transfer to casserole dish.
- Top casserole with remaining cheese.
- Bake for 25 to 30 minutes or until cheese is melted and bubbling.
Serving Size1/12 Recipe
Amount Per Serving Calories 228Total Fat 14gCarbohydrates 4gFiber 1gProtein 23g
Yum! This looks fabulous and easy to make too! I'm always keeping my eye out for healthier Mexican casseroles like this.
Not a very pretty looking dish, but very, very tasty! Easy and fast to put together if you have cut up chicken cubes on hand.
Me and my wife are always trying new Low-Carb recipes. We topped it with a little salsa and sour cream. This one is a keeper!
I made this is, I just substituted olive oil for coconut and used Pepper Jack cheese cause it was what I had on hand, it was delicious.
This was very good! My husband & 9 year old both liked it. Added some green onions, sour cream, & hot sauce after it was cooked. Definitely making again.
This is so easy, quick and delish!! We added garlic and more bell peppers.. and ate with low carb tortillas or pork rinds.. Will be added to our monthly rotation.
Yum, sounds amazing!
This has become a staple in our rotation. Not only good with rice but makes great burritos and wraps!!
That sounds yummy!
This was sooo good!! I added a sprinkling of fresh cilantro and some jalapenos for a little extra spice. Even my husband and son who are not eating low-carb enjoyed it. Definitely will be adding this into the dinner rotation.
Mmm! I love the idea of adding jalapenos!
I am always looking for new keto recipes. This is a keeper! Thank you for sharing it. I Julienned the meat and vegetables to be more restaurant style
This was absolutely amazing. Everyone loved it. My husband said to make a double batch next time. There was no leftovers.
I'm so glad to hear it!
It is very good: but, I had to cut the cheese in a half. I follow a pretty strict low carb diet; but, I find that low carb diets are sometimes heavy on the cheese which for someone older who has to watch their cholesterol, it's not advisable. Cutting the cheese in half didn't affect how good this is!
This is my third time making this recipe and it is so easy yet yummy for even my picky eater!!!
You just gotta try this one!
This was fantastic!
I did add jalapenos and served with sour cream and salsa.
Will certainly be making a double batch next time!
Adding jalapenos is great!
Just made this tonight and it was amazing! I used pepper jack cheese, sprinkled the onions and peppers with onion powder and garlic powder and added a layer of fresh chopped cilantro before I put the top layer of cheese on!! Magnificent!
I need the sodium per serving. Can you help please? Thanks
I'm so sorry, I do not have that info - perhaps you could run the recipe through an app like MyFitness Pal?
Thank you so much for doing all of this & taking the guesswork out of what I can possibly make for supper! Very busy family & starting new business...opening up a store! Merry Christmas to you & your family!!
Simply delicious. Thanks for the yummy recipe!
You're welcome! 😉