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Mushroom Burger with Horseradish Aioli

This Mushroom Burger with Horseradish Aioli is a delicious gluten free burger recipe! It’s made with caramelized onions and topped with a creamy homemade horseradish aioli!

Gluten Free Mushroom Burgers with Horseradish Aioli

So lately I’ve been diggin eating sandwiches or burgers without the buns. I mean, honestly you don’t miss it that much. Plus the bread really just “fills” you up and stops you from eating the good stuff.

In this case, the juicy burger and mushrooms!

Image of Burger Patties

This burger is my take on a Mushroom Swiss burger, but without the swiss because I don’t like swiss.

Ahhh.. gasp! I know right! What’s a Mushroom Swiss burger without the Swiss? Well it’s just a Mushroom Burger. To be honest, if I had to choose, I’d rather put fontina or havarti cheese on this bad boy instead of Swiss. But I chose to leave out the cheese all together and added this amazing horseradish aioli instead!

My husband is obsessed with anything horseradish so I knew he was going to love this sauce.

Image of a Mushroom Burger with Horseradish Aioli on a Plate

What I didn’t expect was how much I would love it; especially combined with the sautéed mushrooms and onions.

When I was making this dish I had the burgers out of the grill, the mushrooms and onions cooking, and I was finishing up the sauce. As I was mixing I had this stroke of genius … and this is when things start to get good.

When I cook I try to make sure it is a cohesive dish. So if I use smoked paprika in the main dish, I will make sure that whatever I’m serving it with has that same flavor so everything goes well together.

Tips for Making this Mushroom Burger

When I was making the horseradish aioli, I added some stone ground mustard to it and then I thought… ohhhh let’s add a little bit to the mushroom and onion mixture so they all flow together. BEST DECISION EVER! It totally completed the dish and made everything flow perfectly!

Image of Caramelized Onions & Mushrooms

Wanna know a secret? Most of the time I don’t feel like I know exactly what I’m doing or going to make. It’s like a fun game I play. I’ll open my spice drawer and start adding whatever sounds good to me. Sometimes it doesn’t turn out, and other times the flavor blows me away!

This is one of those dishes that blew me away. The smells were enchanting as I was making it, but then when I cut into the burger and took the first bite I fell in love. I’ll definitely be making this Mushroom Burger on repeat all summer!

Image of a Mushroom Burger with Horseradish Aioli From Above

And believe me, you will too once you try it.

It’s the perfect way to ring in grilling season. And if you’re anything like us, you’ll be having a burger at least once a week in the summer! Cuz once October hits those delicious smoke flavored burgers will be long gone, so eat them while you can!

PS just to get you more in the mood … keep your eyes open for next weeks roundup of Mouthwatering Burgers! After gawking at those pictures you’ll be drooling all over your keyboard. Guaranteed!

Bon Appetit friends! Happy Grilling! 🙂

Image of a Plate Containing a Mushroom Burger with Horseradish Aioli

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Image of a Plate Containing a Mushroom Burger with Horseradish Aioli

Mushroom Burger with Horseradish Aioli

  • Author: Krista
  • Prep Time: 5 minutes
  • Cook Time: 26 minutes
  • Total Time: 31 minutes
  • Yield: 4 burgers 1x
  • Category: Dinner
  • Method: Grill
  • Cuisine: American
  • Diet: Gluten Free


This Mushroom Burger with Horseradish Aioli is a delicious gluten free burger recipe! It’s made with caramelized onions and topped with a creamy homemade horseradish aioli!


  • 1.25 lbs. lean ground beef
  • salt & pepper to season
  • 2 tablespoon grape seed oil
  • 1 large sweet onion, sliced
  • 8 oz. sliced white mushrooms
  • 2 teaspoons fresh thyme
  • 1/2 tablespoon stone ground mustard
  • salt & pepper to taste
  • 1 large beefsteak tomato, cut into 4 thick slices
  • 2 cups of greens (I used a baby spinach & kale mixture)

Horseradish Aioli:

  • 1/3 cup mayo
  • 1 1/2 tablespoons prepared horseradish
  • 1 tablespoon stone ground mustard
  • 1 tablespoon lemon juice


  1. Preheat grill to medium high heat, about 375-400 degrees.
  2. Form four 1/3 lb. patties. Season both sides with salt and pepper. Set aside.
  3. Heat a large saute pan to medium high heat. Add grape seed oil and onions to the pan. Saute for 5-7 minutes, until slightly caramelized. Add in the mushrooms. Saute until brown, approximately 5-7 minutes. Season with salt & pepper. Add in the fresh thyme and mustard. Stir to mix all the ingredients together. Cook for another 2 minutes. Remove from heat.
  4. In a small bowl, add mayo, horseradish, 1 tablespoon of stone ground mustard, and lemon juice. Stir till smooth and everything is mixed. Set aside.
  5. Add the burger to the grill. Grill each side for 4-5 minutes.
  6. Assemble the burgers: 1 slice of tomato, 1/2 cup of greens, burger, 1-2 tablespoons of horseradish aioli, 2-3 tablespoons of mushroom onion mixture.
  7. Devour!


  • Serving Size: 1 burger
  • Calories: 423
  • Sugar: 4 g
  • Sodium: 603 mg
  • Fat: 27 g
  • Saturated Fat: 7 g
  • Carbohydrates: 11 g
  • Fiber: 2 g
  • Protein: 31 g
  • Cholesterol: 105 mg

Keywords: mushroom burger, mushroom burger recipe, horseradish aioli, bunless burger, healthy burger, gluten free burger, grilling recipe, easy grilling recipe, summer grilling recipe

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Title Image for Mushroom Burgers with Horseradish Aioli



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15 comments on “Mushroom Burger with Horseradish Aioli”

  1. Avatar photo
    Jennifer Reyes

    My husband said, “You hit it out of the ballpark,” and offered to do the dishes! He REALLY liked it. I did bump up the seasoning, adding more horseradish to the sauce along with a little more lemon juice to cut the sweetness of the mayo. I also mixed a few minced garlic cloves and a few tablespoons of horseradish with the hamburger, plus ample fresh-ground pepper in the mushroom mixture. It was really delicious!

    1. #Winning! You know it is good when they volunteer to do the dishes! I am thrilled this recipe was a hit!

  2. Avatar photo
    Anna @ Crunchy Creamy Sweet

    I absolutely love the horseradish aioli idea as a burger topping! My Hubby will go crazy for it!

  3. Avatar photo
    Dorothy at Shockingly Delicious

    Who needs the bun when you have all that flavor! I can’t wait to try the creamy horseradish aioli!

  4. Avatar photo
    Renee - Kudos Kitchen

    This burger looks seriously delicious and that horseradish aioli the the perfect sauce to top it all off!

  5. Avatar photo
    Indian food Edmonton

    No one will be missing the beef after tasting these vegetarian burgers. They’re moist, tender and full of flavor.