If you're craving Mexican food, these simple keto fajitas will leave you satisfied every single time!
It's the one-pan meal (ready in under 20 minutes) the whole family will love.
In fact, this healthy fajita recipe is so quick and easy to put together in one sheet pan. I'll even show you how to create a quick and easy fajita seasoning that's both low carb and keto.
You can enjoy this delicious Mexican meal in my favorite keto tortillas, or with cauliflower rice (grab my easy no-mess cauliflower rice recipe here!). You'll enjoy it with Mexican coleslaw salad with lime dressing.
Don't forget all the toppings - sour cream, cheese, and avocado with a squeeze of lime juice are my favorites!
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What are keto fajitas?
The fajita is a Tex-Mex dish filled with little strips of meat cut from the beef skirt. As time went by, people have become creative in making signature fajitas that they’re now made with different fillings not limited to the cuts of beef skirt.
Originally, back in the 1930s, the beef skirt would be given to Mexican ranch workers (vaqueros) along with the hide, head, and entrails as part of their wage for the day. They made hearty dishes with what they were given which gave rise to the evolution of fajitas as we know them today.
The term ‘fajita’ now describes anything cooked and wrapped up in soft tortillas, or served on a hot skillet. In this recipe, you’ll find out how I make it with steak and a sheet pan!
Keto fajitas take everything you know and love about the classic Mexican staple, but strip out much of the carbs so you can enjoy them guilt-free.
This is one of my favorite keto recipes!
Ingredients
Making these keto fajitas is simple. All you need are a few basic ingredients:
- Steak - flank steak or skirt steak work well. You can also use sirloin steak if you'd like. You'll want the steak strips to be evenly cut. Sliced steak should be about ¼" thick.
- Bell peppers - bell pepper has a moderate amount of carbs so you don't want to overboard here. Thankfully a little goes a long way! I used yellow and red bell peppers in this recipe, but you can choose your favorite variety.
- Onions - again, peppers and onions are both moderate in carbs, so we are going to make a little go a long way. I used a thinly sliced red onion for this recipe, but yellow works very well too.
- Lime and lemon - we will use both lime juice and zest, as well as lemon juice and zest.
- Homemade fajita seasoning - this low carb fajita seasoning is easy to put together. All you need is crushed fresh garlic (or garlic powder), chili powder, ground cumin, salt, and pepper.
See the keto fajitas recipe card at the bottom of this post for exact quantities.
Instructions
Since this is a sheet pan recipe, it's incredibly easy to make this one-pan meal. Mix. Bake. Serve.
First, if you like you can cover your sheet pan with aluminum foil to make clean-up a breeze. I personally like to scrape off all the caramelized pieces and add them to the beef fajitas.
Step 1: Mix
Simply mix together all the keto fajita ingredients on the sheet pan. Mix well so everything is evenly coated, then spread out the fajita mixture evenly on the pan. You want the bell peppers as spread out as possible for that classic flavour.
Step 2: Bake
Next, bake the low carb steak fajitas in a pre-heated oven for 15 minutes. Stir it when you are halfway through cooking.
Step 3: Serve
Place the cooked beef on a heat-proof chopping board and slice it into thin strips.
Serve hot with your favorite keto friendly toppings like sour cream, shredded cheese, and sliced avocados. Don't forget the low-carb tortillas...enjoy!
How to serve low-carb fajitas
There are so many ways to enjoy sheet pan fajitas.
One bowl meal: Serve the sheet pan fajitas into a colourful Mexican-themed bowl and pile sour cream, guacamole, and cheese on top.
Keto burrito: You can roll them up in a keto tortilla wrap, with extra shredded lettuce, fresh salad, shredded cheese, sour cream and avocado.
Keto taco: You can also serve them open in a tortilla as a keto Taco Bell copycat taco.
Cheese taco shells: Place keto beef fajitas, shredded lettuce, guacamole, sour cream, and salsa inside a crispy cheesy keto taco shell for the supreme crunch.
Variations
Want to change up these low-carb fajitas? Here are a few ideas:
- chicken fajitas - swap out the flank steak for chicken breasts or boneless skinless chicken thighs.
- spicy fajitas - pump up the spice in this recipe with extra chili powder. Add in a sliced jalapeno for extra heat!
- smokey fajitas - use smoked paprika instead of regular for a hit of smokey flavour in your taco seasoning.
- pork fajitas - use some leftover pulled pork or pork chops into the fajita mix with fresh low-carb vegetables, and make a delicious low-carb Mexican meal.
Storage
Keto steak fajitas should be stored in an airtight container. It will keep in the fridge for 2-3 days.
Alternatively, you can freeze the fajitas for up to 3 months.
FAQs About Keto Fajitas
It's best to use skirt, flank steak, flap steak, rump steak, or beef schnitzel strips.
Craving keto chicken fajitas? No problem! It's easy to swap out some boneless skinless chicken thighs (or chicken breasts if you prefer) for the flank steak in this recipe.
Just keep an eye on it as it cooks and make sure the meat is thoroughly cooked.
There are a million ways to enjoy this versatile keto diet staple! Eat it in lettuce wraps, with cauliflower rice, or on low carb tortillas.
Why not make a bed of greens and turn this into a low carb and keto fajita salad?
And don't forget the toppings! Sour cream, fresh cilantro (chopped cilantro is my preference), sliced avocados, bell peppers, shredded cheese...yum.
However you serve them, these keto fajitas are absolutely delicious and one of my favorite keto diet staples.
The best side dishes for beef have to be fresh lettuce, avocado, lime wedges, cheese, sour cream, and of course, avocado. With so much flavour, you can see why this fajitas recipe is a popular family dinner.
If you prefer to make this on the stove top, a cast iron skillet will work well. You can even put the cast iron skillet right in the oven too! Make sure your beef steak or chicken breast is thinly sliced. Everything gets cooked in the same skillet. Cook on a medium high heat.
To reduce the carbs further, cut back on the peppers and onions which are slightly higher carb than other ingredients in the fajitas. You can use onion powder instead and serve in lettuce wraps.
No, refried beans are legumes that are high in carbs. But you can use my keto "refried beans" copycat recipe. It is a versatile addition to any low-carb keto Mexican dish to make you feel like you are in an authentic Mexican restaurant.
Olive oil, avocado oil, chili-infused oil, or even coconut oil.
Regular fajitas are high carb with flour tortillas, refried beans, and often rice. This recipe is low-carb keto-friendly with homemade taco seasoning.
As long as the ingredients are just beef, chicken, and low-carb vegetables, then it may be keto. You have to ask what other ingredients have been added and avoid all necessary carbs such as flour, tortillas, nachos, and sweet sauces.
Onions and bell peppers are higher in carbs so it pays to reduce how much you eat so you can stay on track with your ketogenic diet.
Yes! This is one of my favourite keto recipes to prep. I simply divvy out the fajita mixture into a meal prep container and enjoy.
📖 Recipe
Please rate this recipe.
Keto Sheet Pan Steak Fajitas Recipe
Calculate ingredients
Ingredients
- 2 cloves garlic minced crushed
- 1 onion sliced thin
- ½ teaspoon chilli powder or more to taste
- 1 tablespoon ground cumin powder
- +/- salt and pepper to taste
- 60 ml (¼ cups) coconut oil or olive oil
- 1 lime juice and zest
- 1 lemon juice and zest
- 750 g (1.65 lb) steak
- 1 red pepper/capsicum sliced
- 1 yellow capsicum/bell pepper sliced
Equipment
Instructions
- Mix all the ingredients together in the sheet pan/baking tray.
- Bake at 180C/350F for 15 minutes. Stir halfway through cooking so the fajitas are cooked and mixed thoroughly.
- Serve on Mexican coleslaw with lime dressing, inside a keto tortilla, or on a simple green salad with lime juice and olive oil drizzled over.
Notes
- To reduce the carbs further, cut back on the onion and peppers which are slightly higher carb than other ingredients in the fajitas. You can use onion powder instead.
- Turn once during cooking to ensure the beef steak marinates and cooks in all the delicious homemade taco seasoning.
5-INGREDIENTS COOKBOOK
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YOUR HOLIDAY PANTRY & GIFT GUIDES
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Approximate nutrition information is provided for convenience and as a courtesy only. For the most accurate nutritional data, use the actual ingredients and brands you used in your preferred nutrition calculator.
More keto Mexican recipes
Are you hungry yet? Once these keto steak fajitas start cooking in your oven (or even on the BBQ), your kitchen will be filled with the most amazing aromas.
Give these vibrant, healthy and colourful fresh keto Mexican delicious recipes a try!
- Keto taco salad (with cheese taco strips)
- Zucchini taco boats
- Instant Pot chicken taco soup
- Ground beef stuffed peppers
- Low-carb Mexican chicken burgers
Luciana
Hi Libby, I'm keen to give this recipe a go. I don't see the steak in the recipe list though, am I missing something?
Thanks so much!
Libby Jenkinson
Hi Luciana, I think you may have skimmed it, it's the 3rd ingredient from the bottom. 750g steak. I hope you enjoy all the delicious flavours in this easy mid-week dinner.
Mike
Libby, I just wanted to say that you nailed the seasoning perfectly on the fajitas. Although not a Texan, we make and eat a fair amount of Tex-Mex food and this was a great find. For your readers who have the time and a grill, I would suggest marinating the skirt steak (or flank if you can't find skirt) overnight. We used your recipe for this and placed the oil, seasonings, one small sliced onion and some cilantro (coriander) in a zipper bag and refrigerated overnight. In the morning, we flipped the bag over before work and when we got home, I grilled the steak to a medium rare while cooking the peppers and a couple of additional sliced onions on the grill also. This turned out absolutely fantastic. For me the cilantro is much more than garnish, it is an essential part of any Tex-Mex recipe.
For those that like it a little spicier, some red pepper flakes or cayenne pepper added to the marinade will give it some bite. We grilled jalapeno peppers and served on the side.
Libby www.ditchthecarbs.com
Hey there Mike, what an awesome suggestion to marinate the meat overnight, and in a zipper bag to make it super easy to flip and rub the marinade in. I'm so glad you loved these, an easy one-pan family meal for sure.
Jan
Why so many images of same dish? All this just slows down loading site. We all know what sliced red peppers look like. Please. Stop the incessant food porn. Same goes for many other sites. Show us what cooked recipe looks like and the recipe. A few tips and maybe a video. Promote then move on. Right now your site is hung up on one of your videos. Sorry. Might have liked this.
Libby www.ditchthecarbs.com
Hi there, if you would like to become a member of my private site for paying members and no advertising, you can join here. No advertising. No promotions. This is the free site where unfortunately advertising is required 🙂
Colleen
Yes I’m not the person above, I’m just looking at your site for the first time and I know the way this is set up may be out of your control with the ridiculous amount of scrolling and scrolling over incessant unwanted Ads and I wasn’t sure half the time if some of them were connected with you or not.
I must say though that I’ve been on the site for ages trying to work it all out and it’s not easy at all because of this.
I don’t understand why you’re in NZ but the online membership and other content is from the USA except that you must have affiliates living there.
I was also looking for a ‘contact’ form as I have questions, found it once then for the life of me spent ages but couldn’t find it again
I’m only using this other persons reply as I can’t find yours!
My main Q is whether there’s any other alternative than to join the membership as I, not sure if it’s right for me.
I am already educated on the nutritional side of the low carb and keto way of eating as I’ve bought a few excellent books over years, I just need help with basic planning of a very simple budget meal plan with alternative recipes for milk and cheese.
I haven’t got the energy to spend ages in food preparation but I can see that so,e of your recipes are quite simple.
Also I don’t need to go into all the other basic educational part of your membership.
If it was in NZ dollars I’d give it a try for a month or so but $35USD Is probably close to $65 a month AUD which I can’t afford on a,pension.
I’d appreciate some further information.
Thank you
Libby www.ditchthecarbs.com
Hi there Moana, apologies for the adverts, this is what pays for my ever-increasing bills required to keep my site going, but my private members-only website is advert free. Yes, I price in USD because 85% of my readers are from the US and I have a diverse worldwide audience and so everyone understands US$ but no-one would understand NZ$. Ditch The Carbs PRO - is the most popular online course that guides you every step of the way PLUS mini-challenges so you can make progress FAST! You can join and get started today. Please read all the FAQ on the joining page, I am always completely transparent to say it's not for everyone. It's for those who are absolutely 110% ready to commit to low-carb for life! If you just want meal planning and budgeting tips, maybe subscribing to the meal planner would be more advantageous for you perhaps? You can see them here. (P.S. I removed your email from your comment to protect your privacy) 🙂
Mabel
What quantity is considered one serving for tracking purposes? How many grams or ounces please, if anyone knows. Thank you
Libby www.ditchthecarbs.com
Recipe states it serves 5. You can also use the converter inside the recipe to dial up or down how many servings you wish to make (the nutrition panel will remain the same).
audrey y
What cut of steak would you recommend? Every time i buy pre-cut steak strips, they come out like leather
Libby www.ditchthecarbs.com
It sounds like you are cooking them for too long, I simply buy beef schnitzel or minute steaks. Both are the very thin cuts of meat.
Lee
I can’t get the coke Slaw recipe to come up. What am I doing wrong?
Libby www.ditchthecarbs.com
I just checked and the link works, but here it is again just in case. It's soooooo good.
Dawn Winstead
Sorry!!! I some how missed reading the first paragraph where you stated skirt steak I do not know how I did that??? So no need to answer my question!!! Thank You & God Bless You For All The Wonderful Recipes & Helpful Advice!!! 🙂
Dawn Winstead
Hello! What cut steak do you suggest best for this? I know a thinner type like flank etc. but I've seen in some info read while back when eating keto said some cuts grass fed beef better than others. Thank You & God Bless You! Not sure why the question for help to make a crisper crust is posted on this recipe??? But I would like know answer too! 😉
Marie
What kinds of steak work best in the sheet pan recipe?
Denise
Can anyone give me tips on making he crust CRUNCHY and crisp? Mine came out a bit soft and soggy, but taste was fine. I rolled fairly thin and cooked on parchment on my pizza pan.
I did top with sauce and toppings as soon as it came out without letting it cool.
Thanks in advance! Will make again with some suggestions for a crispier crust!
NJroute22
You forgot the onion and cilantro in your ingredients list!!
Libby www.ditchthecarbs.com
Whoops, I forgot the onion. Cilantro/coriander was just for garnish. Thank you for spotting this.