If you are looking for an easy low carb dinner that tastes like restaurant fajitas without the tortillas, this low carb steak fajita casserole is the perfect recipe. Made with seasoned steak, colorful bell peppers, melty cheese, and bold Mexican-inspired flavors, this keto fajita casserole is filling, easy to make, and ideal for busy weeknights.
Unlike traditional fajitas, this baked fajita casserole comes together in one dish and reheats beautifully for meal prep. Whether you call it a beef fajita casserole, steak fajita bake, or keto Mexican casserole, this recipe delivers big flavor with very little effort.
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Why You’ll Love This Low Carb Fajita Casserole
- easy weeknight dinner
- keto friendly
- high protein
- low carb comfort food
- freezer friendly
- customizable with steak, chicken, or ground beef
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.
Ground Beef Fajita Casserole
Swap steak for hamburger meat for a budget-friendly version.
Chicken Fajita Casserole
Use shredded or diced chicken breast.
Keto Mexican Casserole
Add cauliflower rice, jalapeños, or taco seasoning.
Bison Fajita Casserole
Great use for lean ground bison.
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 tortilla chips, easy blender salsa 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.
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.
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.
Ingredients Needed for Low Carb Steak Fajita Casserole
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
How to Make Low carb Steak Fajita Casserole
Step 1: Cook the Steak and Vegetables
Slice peppers and onion. Drizzle olive oil into the pan and cook on medium heat to medium-high heat until softened.
Step 2: Prepare the Low Carb Fajita Filling
Slice steak into strips and fry until cooked all the way through, add seasoning, and stir thoroughly.
Step 3: Assemble the Keto Fajita Casserole
Add all cooked vegetables and meat to a casserole dish, and sprinkle with cheese.
Step 4: Bake Until Hot and Bubbly
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.
What to Serve With Low Carb Steak Fajita Casserole
- Salsa Verde Recipe | Easy Tomatillo Salsa
- Simple Chunky Garden Salsa Recipe
- Easy Blender Salsa Recipe (2 Minutes)
- Keto Air Fryer Chips | Easy Zero Net Carb Snack in 5 Minutes
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.
- Low Carb Riced Cauliflower Recipes for Keto – This post shares 40+ low-carb recipes that use riced cauliflower as a main ingredient.
- Low Carb Chicken Alfredo Casserole – Creamy alfredo and perfectly seasoned chicken come together to create a low carb casserole that the whole family can enjoy.
- Easy Low Carb Meatball Casserole Recipe – This simple casserole combines the flavors of delicious meatballs and melty cheese for the perfect family dinner.
- Crispy Low Carb Fried Chicken Without Pork Rinds – Craving fried chicken but sticking to a low-carb diet? This recipe is for you!
- Low Carb Chicken Alfredo Recipe in One Large Skillet– Serve up a delicious meal without all of the dishes with this one pan meal that the whole family will love.
- How to Cook a Whole Chicken in the Slow Cooker – The possibilities are endless for low carb dinners once you learn how to make a whole chicken in a crock pot.
- SCD Deep Dish Pizza Recipe with Almond Flour Crust– Enjoy pizza night at home with this gluten-free deep dish pizza recipe.
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Can I make fajita casserole with ground beef?
Yes. Ground beef works well in this keto fajita casserole and creates a more affordable version of the recipe.
What is the best steak for fajita casserole?
Flank steak, skirt steak, or thinly sliced sirloin work best.
Is fajita casserole keto?
Yes, this recipe is naturally low carb and keto friendly because it skips tortillas and uses high-protein ingredients.
Can I freeze low carb fajita casserole?
Yes. Allow it to cool completely before freezing in an airtight container.
Can I make this recipe with chicken?
Absolutely. Chicken fajita casserole is one of the most popular variations.
What can I make with beef fajita meat?
Beef fajita meat works well in casseroles, skillet meals, tacos, salads, stuffed peppers, and low carb bowls.
Low Carb Steak Fajita Casserole
Low carb steak fajita casserole is an easy keto dinner recipe with seasoned beef, peppers, cheese, and bold fajita flavor.
Ingredients
- 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
Instructions
- 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.
- Add all cooked vegetables and meat to a casserole dish, sprinkle with cheese.
- Bake for 10 minutes. Serve and enjoy.
Notes
- Serve with a side salad of lettuce, tomatoes, and sour cream.
- Use John Soules Beef Fajitas to cut the time for this recipe in half.
Nutrition Information
Yield
4Serving Size
1Amount Per Serving Calories 366Total Fat 24gSaturated Fat 10gTrans Fat 0gUnsaturated Fat 13gCholesterol 55mgSodium 415mgCarbohydrates 15gFiber 3gSugar 5gProtein 24g
The nutrition in recipes is caluculate by AI, mistakes happen. It is highly recommended to check carb counts to make sure these recipes fit into your diet.
About Thirty Something Super Mom
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.
it looks delicious, I would love to try it, and I loved the tip about making such a great meal at Monday so I will have the leftovers, only that I do not think that I will get any leftovers with such meal:)
¡Tu marido es muy simpatico!
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!
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.
This looks so perfect despite being low carb! Perfect for on-diet cravings!
Look so yummy! cant wait to make this tonight!
What a yummy recipe! We recently got an air fryer, so we would love to try to make this ourselves.
Wow. Another great recipe!