Fire up the grill for these crave-able fajita burgers bursting with bold southwest flavor! Juicy beef patties are loaded with sautéed peppers and onions, topped with melty pepper jack cheese and zesty fajita seasoning.

Beautiful vibrant shot of a grilled burger patty on a bun with grilled peppers and onions and a sauce.

Calling all burger and fajita lovers! This recipe combines the juicy satisfaction of a classic burger with the explosive flavors of your favorite fajita fillings. This recipe combines seasoned ground beef patties, grilled fajita veggies, melty cheese, and a dollop of creamy guacamole – all nestled in a toasted bun. This fajita burger recipe is perfect for summer cookouts, weeknight dinners, or any time you crave a taste of Tex-Mex flair.

What Is A Fajita Burger?

Looking for a new way to spice up your burger recipes? Try this delicious fusion fajita burger topped with grilled onions, peppers, manchego cheese, and homemade guacamole.

This burger has got all the flavors of fajitas in burger form! This fajita burger recipe is perfect for anyone who wants to break free from the burger rut. It’s a great option for summer cookouts, a fun twist on a weeknight meal, or any time you’re craving your favorite fajita flavors that go way beyond your average burger. Plus, they’re the perfect way to crush those Mexican food cravings, like our chicken enchiladas or steak tacos

Char Grilled Fajita Burger piled high with guac, peppers and onions. Dig in!

Fajita Burger Ingredients

  • Fajita Seasoning: This is the magic dust that transforms your ordinary burger into a fiesta of flavors. Chili powder, cumin, paprika, and cayenne pepper add a smoky, warm, and slightly spicy kick. Garlic powder sneaks in a savory punch to round out the flavor profile.
  • Ground Beef: This is the base of your burger, the hearty layer you sink your teeth into.
  • Sliced Onion & Peppers: These guys add freshness, vibrant color, and a bit of sweetness to balance the savory and spicy notes. Slicing them thin ensures they cook evenly alongside the burger.
  • Olive Oil: A drizzle of olive oil helps everything sizzle and sear beautifully on the grill or pan.
  • Manchego Cheese: Manchego, a creamy Spanish cheese, adds a salty richness and a melt-in-your-mouth texture that complements the other flavors.
  • Guacamole: This cool and creamy avocado spread adds a delightful freshness and a touch of healthy fat.
  • Lettuce & Tomato: These classic burger companions provide a crisp, refreshing counterpoint to the richer ingredients.
  • Brioche Buns: These soft and slightly sweet buns cradle all the deliciousness, holding everything together in a happy, bready hug.

How to Make a Fajita Burger

  • First things first, fire up your grill! Get one side nice and hot to 400°F, but leave the other side off for indirect heat – this will come in handy later.
  • Next, whip up your fajita seasoning. In a small bowl, combine the chili powder, cumin, paprika, cayenne pepper, and garlic powder. Set it aside for a sec, we’ll use it soon.
  • While that’s chilling, grab your ground beef and mix in 2 tablespoons of that yummy fajita seasoning. Time to shape it into 6 delicious patties. Make a little indent in the center of each one with your thumb – like a fingerprint! Don’t forget to season them with a sprinkle of salt and pepper.
  • Toss your sliced onions and peppers with some olive oil and a pinch of salt. Throw them in a grill basket and put them on the cooler side of the grill (remember, that’s the indirect heat zone). Grill for 7-10 minutes, tossing them every now and then until they’re nice and softened with some char marks.
  • Place your seasoned patties on the hot side of the grill and close the lid. Grill them for 4-5 minutes per side, flipping them halfway through. We want them cooked to a safe internal temperature of 160°F.
  • While the burgers are getting close to perfect, toss the buns on the cooler side of the grill to toast them up a bit.
  • When the burgers are nearly done, top each one with a slice of melty Manchego cheese. Close the lid for a quick second to let that cheese get all gooey. Then, take them off the grill and let them rest for a minute.
  • Open up those toasted buns and layer them with lettuce and tomato on the bottom. Plop that juicy burger on top, followed by a dollop of guacamole and a generous pile of your perfectly grilled veggies. You might want to grab an extra napkin. Things are about to get delicious!

Girl Carnivore Expert Reicpe Tips

  • Love a little extra heat? Add a pinch of red pepper flakes or chopped fresh jalapenos to your burger mixture for an extra kick of spice.
  • Instead of the usual lettuce and tomato, elevate your burger with a dollop of sour cream, creamy guacamole, pico de Gallo, and a sprinkle of fresh cilantro for a vibrant and flavorful twist.
  • Feeling adventurous? Skip the bun altogether and serve your fajita burger on a warm tortilla or a bed of leafy greens. 
  • For a zesty twist, add a little lime juice to your finished burgers. 

What to Serve With This Delicious Burger

Get your Mexican food fix by serving up your burger with an easy grilled corn salad. We also love adding a drizzle of poblano crema or rajas con crema to the top of the burgers for a little heat.

Leftovers & Reheating

Leftover fajita burgers can be stored in an airtight container in the refrigerator for up to 3-4 days. If you’re planning on enjoying them way later, consider freezing them in an airtight container or freezer bag for up to 2 months.

PRO TIP: To prevent the burger bun from getting soggy, disassemble your leftover fajita burgers. Wrap the burger patties and cheese tightly in plastic wrap or aluminum foil. Place the grilled veggies in a separate airtight container.

​To reheat:

For the best results, reheat leftover fajita burger patties in a large skillet over medium heat. A tablespoon of olive oil can help prevent them from drying out. Heat them through until warmed all the way (about 5-7 minutes per side).

While the burger reheats, toss your fajita veggies in the skillet for a minute or two to bring back their vibrant flavors and warm them through.

Toast your buns lightly in the skillet or in a toaster for a warm and slightly crisp base for your reassembled burger masterpiece.

If you’re short on time, you can reheat the burger patty in the microwave on medium power for 1-2 minutes per side, flipping halfway through. Be aware that this method can dry out the patty, so the skillet method is preferred for optimal taste and texture.

More Great Burger Recipes

So ditch the boring burger routine and get grilling! This fajita burger is sure to become a new favorite. If you try this recipe, please rate the recipe card and leave a comment below to help out the next reader!

Char Grilled Fajita Burgers

5 from 1 vote
Prep: 5 minutes
Cook: 20 minutes
Resting Time: 5 minutes
Total: 30 minutes
Servings: 6
A Fajita Burger with guacamole, lettuce and tomatoes on a plate.
This grilled fajita burger recipe features juicy beef patties loaded with sauteed peppers and onions, cheese, and zesty fajita seasoning.


For the Fajita Seasoning

  • 1 tbsp chili powder
  • 1 tsp cumin
  • 1 tsp paprika
  • 1/2 tsp cayenne pepper
  • 1/2 tsp garlic powder

For the Burgers

  • 1 lb ground beef
  • 1 onion sliced into 1/4" slices
  • 1 green pepper stemmed, seeded and sliced
  • 1 red pepper stemmed, seeded and sliced
  • 1 tbsp olive oil
  • 6 slices Manchego cheese
  • 1/4 cup guacamole
  • lettuce and tomato
  • 6 Brioche buns


  • Preheat one side of your grill to 400°F, leaving the other side off for indirect grilling.
  • Combine chili powder, cumin, paprika, cayenne pepper and garlic powder in a small bowl. Set aside.
  • Meanwhile, mix 2 tablespoons of fajita seasoning into the ground beef.
  • Form the ground beef into 6 patties. Make a dimple in the center of each with your thumb and season with salt and pepper.
  • Toss the onion slices and peppers in olive oil and sprinkle with salt. Arrange the veggies in a grill basket and place on the cooler side of the grill over indirect heat, tossing occasionally until veggies are charred and softened, 7-10 minutes.
  • Arrange the patties on the hot side of the grill and close the lid. Grill 4-5 minutes per side until internal temperature reaches 160°F, flipping once halfway through for even cooking.
  • Place the buns on the cool side of the grill to toast.
  • When the burgers are almost done, place a slice of Manchego cheese on each burger. Close the lid to allow the cheese to melt. Remove from grill and rest the burgers.
  • Arrange the buns with lettuce and tomato on the bottom bun. Top with a burger, a dollop of guacamole and a healthy pile of fresh grilled onions and peppers.
  • Grab an extra napkin.


Serving: 1g | Calories: 735kcal | Carbohydrates: 44g | Protein: 31g | Fat: 49g | Saturated Fat: 24g | Cholesterol: 227mg | Sodium: 630mg | Potassium: 399mg | Fiber: 2g | Sugar: 2g | Vitamin A: 2237IU | Vitamin C: 44mg | Calcium: 375mg | Iron: 3mg
Course: sandwich
Cuisine: American
Author: Kita Roberts

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Recipe FAQs

Can I make chicken fajita burgers with this recipe?

Yes! You can use lean ground chicken instead of ground beef to make chicken burgers instead. Always make sure ground chicken reaches an internal temperature of 165 degrees F.

Can I use another type of cheese besides manchego?

Absolutely! Feel free to use any type of cheese you like. Some great options are Monterey Jack, pepper jack cheese, Oaxaca cheese, or any other type of cheese you like. 

Can I use premade taco seasoning instead of making fajita seasoning?

Yes! You can use whatever kick-butt taco or fajita seasoning you want.

ho doesn't love a sizzling platter of fresh fajita fixins?! Cuz I know one girl who will never turn a platter of that goodness down. Char Grilled Fajita Burger Recipe puts it all that flavor between two buns.

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Well, Hey, Y’all.

Kita is a multi-talented individual, boasting numerous accomplishments such as being an award-winning recipe developer, world-traveled professional photographer, and journalist. As the lead creative force behind Girl Carnivore®, she is widely recognized as an authority on all things meat.


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