Easy Slow Cooker Chicken Fajitas (for Busy Weeknights)
These easy slow cooker chicken fajitas are exactly what you need for busy weeknights when life feels non-stop and dinner needs to happen fast.
Why You’ll Love This Recipe
- Set it and forget it; the slow cooker does all the work. Takes all the stress out of weeknight cooking
- Chicken breast is tender, moist, and downright juicy(!) thanks to the slow cooking process
- Made entirely from scratch with ingredients you likely already have in your pantry
- You control the sodium (no high-sodium fajita seasoning packets used)
- Versatile recipe that can be used in other Mexican recipes like chicken tacos or enchiladas
I have a fondness for fajitas that dates back to my teenage years. While the mall was the place to hang out, a popular Tex-Mex restaurant was where we went for our fix of restaurant-style fajitas. The aroma of grilled meat, piled high with caramelized onions and colorful bell peppers, left a lasting impression. I love that I can recreate the flavors of those cast-iron fajitas and enjoy all that flavor at home, but in a simpler slow cooker version.
Table of Contents
How to Serve Chicken Fajitas for a Crowd
While this recipe serves six people, it can easily be doubled for your next large gathering. The minimal prep involved and hands-off cooking make this a great option for a make-ahead meal or for one of the many delicious Cinco de Mayo recipes.
You might ask yourself, ‘How many pounds of fajita meat per person do I need?’ A good rule of thumb is 1/3 of a pound per guest. If you plan on serving the chicken fajitas with rice, you can stretch the meat out even further and serve them on smaller tortillas as mini fajitas.
Ingredients
- Chicken Breasts: skinless and boneless
- Yellow Onion: white onion, or Spanish onion, will also do. Any of these three options is the best onion for fajitas. Here is a great reference on how to slice an onion for fajitas.
- Bell Peppers & Jalapeno: they taste great when slow-cooked
- Chicken Broth: to enhance the overall flavor.
- Seasoning Blend: This homemade fajita seasoning is so much tastier (and lower in sodium) than store-bought. This combination includes: garlic, onion, chili powder, as well as ground cumin, cayenne pepper, and salt.
- Tomato Paste & Worcestershire Sauce: imparts the chicken with a great depth of flavor.
- Honey: used sparingly, intensifies the overall taste of the slow-cooked chicken and vegetables.
- Lime: cuts through the spice and brightens up the flavors with its acidity.
- Flour Tortillas, Avocado, Sour Cream, Salsa, and Cilantro for serving
Substitutions & Variations
- Turn the recipe into Buffalo Chicken Fajitas. In step 1, simply swap out the tomato paste for 2/3 cup hot pepper sauce (like Frank’s Red Hot), and replace the lime juice with 1 1/2 tablespoons white vinegar. Just before adding the peppers to the slow cooker, replace the chicken broth with 1/4 cup unsalted butter, cut into chunks. Proceed with the rest of the recipe as written.
- Make Gluten-Free Chicken Fajitas. The spices should all be fine for a gluten-free fajita seasoning (just check for any anti-caking agents that might be added). Make sure to use Lea & Perrins or some other GF Worcestershire sauce. Finally, swap out the flour tortillas and serve the fajitas with corn tortillas or lettuce wraps instead. Additionally, you can serve the chicken with peppers and onions over rice and skip the wrap.
- Switch up the protein: Add 1 lb of flank steak along with 1 lb of chicken to the slow cooker to make chicken and steak fajitas, you can do the same with shrimp to make chicken and shrimp fajitas too.
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Instructions for Juicy Chicken Fajitas
1. In a small bowl, mix the spices with tomato paste, Worcestershire sauce, lime juice, and honey. Stir into a thick paste and set aside.
2. Place the chicken breasts in the slow cooker. Top with sliced onions and chopped jalapeños for a flavorful base.
3. Spoon the fajita seasoning paste evenly over the chicken and onions, coating them thoroughly.
4. Layer sliced red, orange, and yellow bell peppers on top, then place the lid on the slow cooker.
5. Slow cook the chicken, onions, and peppers on low until tender and juicy—about 3–4 hours on low. Reserve some cooking liquid for serving or make a thicker sauce, *see note below about thickening the liquid*
6. Serve the sliced chicken and sautéed peppers with warm tortillas, fresh avocado, lime wedges, and your favorite toppings.
How to Make a Sauce from the Chicken Fajitas Marinade
While my family likes to use the fajitas chicken marinade directly from the slow cooker for chicken dripping in its juices, some might prefer their sauce not so runny. If this is you, read below for directions:
- Drain the cooking liquid from the slow cooker and place it into a saucepan. Set it aside to let it come to room temperature.
- In a separate small bowl, stir together 1 tablespoon cornstarch with 1 tablespoon of the liquid to form a paste. Slowly add a tablespoon of liquid at a time until you have created a smooth slurry.
- Bring the liquid in the saucepan to a gentle simmer. Slowly pour the slurry into the simmering liquid and whisk until smooth. Continue simmering and stirring until the mixture has reached the desired consistency.
Storing and Reheating Leftovers
Store any leftover chicken fajitas in an airtight container for up to 4 days. Reheat in the microwave or on the stove with a bit of the reserved liquid to prevent the meat from drying out. This recipe freezes very well; just note that frozen chicken fajitas are best when eaten within 3 months.
Slow Cooker Chicken Fajitas: FAQ’s
These fajitas are super versatile! Try them with: warm flour or corn tortillas, refried beans, pinto beans or black beans, or rice garnished with cilantro
To prevent the bell peppers from getting too mushy during the slow cooking process, keep them centered and on top of the chicken. Avoid placing them near the sides of the slow cooker (where it is hotter) or at the bottom, as this will submerge them in any accumulated juices and overcook them.
Let the chicken rest for a few minutes, then slice it into thin strips against the grain. This keeps the meat tender and easier to pile into warm tortillas along with the rest of the toppings. If you are looking for a shredded chicken fajita texture, click here.
Easy Slow Cooker Chicken Fajitas (for Busy Weeknights)
Ingredients
Fajita Seasoning:
- 4 teaspoons chilli powder
- 2 teaspoons garlic powder
- 2 teaspoons onion powder
- 2 teaspoons ground cumin
- 1/2 teaspoon smoked paprika
- 1 teaspoon kosher salt
- 1/4 teaspoon cayenne pepper
- 1/4 cup tomato paste
- 2 tablespoons Worcestershire sauce
- Juice of one lime
- 1 tablespoon honey
Chicken Fajitas:
- 2 pounds chicken breasts boneless & skinless
- 2 yellow onions cut into 1/2-inch thick slices
- 1 medium jalapeno finely diced
- 2 tablespoons chicken broth
- 1 red bell pepper sliced lengthwise (½ inch thick)
- 1 orange bell pepper sliced lengthwise (½ inch thick)
- 1 yellow bell pepper sliced lengthwise (½ inch thick)
For Serving:
- Fajita-sized flour tortillas 6-inch size
- Sour cream
- Salsa
- Cilantro
- Avocado
Equipment
Instructions
- In a small bowl, combine the chili, garlic, and onion powder, ground cumin, paprika, salt, and cayenne pepper. Add the tomato paste, Worcestershire sauce, lime juice, and honey. Stir to form a paste and set aside.
- Place whole chicken breasts in the bottom of the slow cooker.
- Layer the onion slices over the chicken and sprinkle the diced jalapeno on top.
- Dollop the paste over the chicken and spread evenly to coat. Pour the broth over the paste.
- Pile the bell peppers on top of the chicken, cover, and cook on low for 3-4 hours or until the chicken registers 165°F (whichever comes first).
- When done, some residual liquid from the cooked chicken and vegetables will remain. You may choose to keep in the slow cooker or turn it into gravy. Instructions for making a gravy are in the post, (scroll up to view).
- Place the chicken breast on a cutting board. Let it rest for 5 minutes and cut into slices. You can plate the chicken and vegetables to assemble the fajitas or return them to the slow cooker to coat them in the residual cooking liquid.
Notes
If you prefer the texture of shredded chicken fajitas, after 3 hours of cooking, break the chicken up with a fork and continue cooking for an additional 30 minutes. Spoon some of the fajitas chicken marinade over the sliced chicken before serving. If you want to thicken the marinade to make a sauce, scroll up for instructions.
1 teaspoon kosher salt can be replaced with ¾ teaspoon table salt.
Nutrition
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I hope you love this recipe as much as I do. Once the kids are back in the school routine, I love pulling out the slow cooker – it makes weeknight cooking so much easier