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Best Cheesy Fajita Mexican Keto Casserole

If you are following a keto diet and love the flavors of Mexican food, this Cheesy Fajita Mexican Keto Casserole recipe is sure to be your next family favorite.

This low carb dinner is the ultimate comfort food because it is delicious and so easy to whip up, making it perfect for busy weeknights.

This post will share how I made this Mexican Keto Casserole as well as inspiration for customizing this recipe to please any palate. 

Keep in mind that this post contains affiliate links which means that if you make a purchase after clicking a link, I will receive a small portion of the sale at no additional cost to you. 

Best Cheesy Fajita Mexican Keto Casserole

Variations on this Mexican Keto Casserole 

The best part of this Mexican Keto Casserole is being able to serve an easy-to-prepare low carb recipe that the entire family will love.

Low carb casseroles are easy to customize using a variety of ingredients. Below you will find some of my favorite ways to customize this recipe. 

Topping Ideas for this Mexican Keto Casserole Recipe

Serve this low carb taco casserole with your favorite taco toppings for a guilt free Mexican dinner perfect for Taco Tuesday.

Everyone can add their favorite toppings like sour cream, cottage cheese, cream cheese, cheddar cheese, Monterey Jack, black olives, or a Mexican cheese blend. 

I love to add lots of cheese so I usually offer a variety of shredded cheese and let the whole family decide which cheese mixture they would like to add.

Sometimes I combine heavy cream with cream cheese to make a cheese sauce that I stir into the meat before adding the remaining cheese on top. 

Serving Ideas for this Mexican Keto Casserole Recipe

This keto Mexican casserole recipe can be served with low carb tortillas, and tortilla chips, or enjoyed straight out of the baking dish for an easy weeknight meal. 

You can also create a taco bowl by spraying taco shells with cooking spray and laying them on top of a muffin pan before baking them at 375 for about 20 minutes.

This is a great way to use the best keto taco casserole for a fun taco night. 

Easy Cheesy Low Carb Fajitas

Meat Options for this Mexican Keto Casserole Recipe 

You can use any taco meat you choose to make a keto taco bake that pleases your family’s taste buds. This delicious casserole can be made with lean ground beef, ground chicken, ground turkey, or even a ground beef mixture. 

Create your own meat mixture and follow the recipe card for homemade taco seasoning ideas that work well in a Mexican keto ground beef casserole as well as an easy Mexican chicken casserole. 

Create a keto ground beef casserole recipe by swapping out the steak in this recipe for ground beef.

This is a simple way to make an easy keto taco casserole recipe with similar nutritional information if you prefer cooking ground beef instead of steak. 

Easy Cheesy Low Carb Fajitas

Add in Ideas for this Mexican Keto Casserole Recipe

You can add in green chiles, green onions, red pepper flakes, fresh cilantro, hot sauce, or jalapeno peppers for an extra burst of spicy Mexican flavors.

You could add cooked cauliflower rice to the casserole dish for an even heartier low-carb taco casserole or stir in tomato sauce to mimic a Mexican rice casserole.

Another add-in idea that my family enjoys is pouring this salsa verde into the casserole before baking.

This salsa can be made in a food processor and instead of allowing it to cool, you can pour it right into this recipe before baking. 

Easy Cheesy Low Carb Fajitas

Ingredients Needed  

A quick overview of the ingredients needed to make this easy keto taco casserole can be found below.

Visit the variations section to find inspiration for customizing this recipe.

You can make this dish following the recipe card exactly and then try some of the variations the next time you want to serve this low carb dinner idea. 

  • Skirt Steak
  • Green Bell Peppers
  • Red Bell Pepper
  • Yellow Bell Pepper
  • Onion
  • Chili Powder
  • Cumin
  • Garlic Powder
  • Onion Powder
  • Paprika
  • Salt & Pepper
  • Olive Oil
  • Provolone Cheese
Best Cheesy Fajita Mexican Keto Casserole

How to Make this Mexican Keto Casserole Recipe

Slice peppers and onion. Drizzle olive oil into the pan and cook on medium heat to medium-high heat until softened. Slice steak into strips and fry until cooked all the way through, add seasoning, and stir thoroughly.

Add all cooked vegetables and meat to a casserole dish, and sprinkle with cheese. 

Bake for 10 minutes. Serve and enjoy.

Be sure to store any leftovers in an airtight container so you can enjoy the same great flavors and textures the next time you decide to eat this keto casserole. 

Best Cheesy Fajita Mexican Keto Casserole

More Keto Recipes for Dinner

Below you will find some of my most popular recipes that make the perfect keto dinners to serve any day of the week.

These low carb recipes make a complete meal with fewer net carbs than traditional recipes without sacrificing flavor. 

From casserole recipes to simple one-frying pan meals, the whole family will love these delicious recipes. 

Never miss another low carb or keto recipe again! Sign up for the free newsletter to get recipes straight to your inbox and follow along on social media to stay connected.

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Best Cheesy Fajita Mexican Keto Casserole

This also makes a great dinner for the whole family, it is a perfect way to get a colorful and healthy meal on the table. I like to serve it with a side of pico de gallo and salsa verde.

Easy Cheesy Low Carb Fajitas 1

Easy Cheesy Low Carb Fajitas


  • 1 & 1/2 lb of skirt steak, cut into strips
  • 3 Green Bell Peppers
  • 1 Red Bell Pepper
  • 1 Yellow Bell Pepper
  • 1 onion, sliced
  • 1 Teaspoon of Chili Powder
  • 1 Teaspoon of Cumin
  • 1 Teaspoon of Garlic Powder
  • 1 Teaspoon of Onion Powder
  • 1/2 Teaspoon of Paprika
  • Salt & Pepper to Taste
  • 2 Tablespoons of Olive Oil
  • 1 Cup of Shredded Provolone Cheese


  1. Slice peppers and onion. Drizzle olive oil in pan and cook until softened. Slice steak into strips and fry until cooked all the way through, add seasoning and stir thoroughly.
  2. Add all cooked vegetables and meat to a casserole dish, sprinkle with cheese.
  3. Bake for 10 minutes. Serve and enjoy.

Nutrition Information

Serving Size


Amount Per Serving Calories 1432Total Fat 106gSaturated Fat 36gCholesterol 268mgSodium 503mgCarbohydrates 7gSugar 1gProtein 108g

About Thirty Something Super Mom

Melissa Dixon Thirty Something Super Mom
Thirty Something Super Mom | Website

My journey started after a Crohn's disease diagnosis, inspiring a commitment to well-being. This site shares my distinctive approach to healthy living with my collection of nutritious recipes that boast authentic flavors, mimicking the indulgence of traditional dishes. I love sharing guilt free recipes for low carb, keto, gluten-free, paleo, and the specific carbohydrate diet. I also share tips on natural living, including homemade cleaners and cleaning hacks. I also share my experience as a veterinary technician and pet groomer, to integrate pet health tips, homemade dog food recipes, and grooming insights to ensure your pets thrive.

Katharina Marin

Sunday 23rd of June 2019

What a yummy recipe! We recently got an air fryer, so we would love to try to make this ourselves.

run 3

Sunday 23rd of June 2019

Look so yummy! cant wait to make this tonight!

Lola Osinkolu

Monday 10th of June 2019

This looks so perfect despite being low carb! Perfect for on-diet cravings!


Friday 24th of May 2019

I've been slowing cutting my carbs each day hoping to get down to the desired count of 25g. These fajitas will make the low-carb life more bearable. I could probably eat these three times a week and not burn out.

Maggie Miller

Friday 24th of May 2019

How darn sweet to buy a variety.... wow! I’ve never put cumin in a fajita or provolone cheese for that matter but I can’t wait to try your recipe! It’s making me hungry just looking at your pictures!!😉 I assume I could do this recipe with steak or chicken? I’ll see which I have in the freezer!

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