Marinated Portobello Mushroom Burgers

$5.68 recipe / $2.84 serving
by Beth - Budget Bytes
5 from 19 votes
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It’s almost grilling season!! I kind of want to make weekend grilling a thing at my house this year, so I’m testing some recipes. I already have some fun burger recipes on the site, so I figured it was time to make an option for all of my vegetarian friends. Marinated Portobello Mushroom Burgers are probably the easiest and tastiest vegetarian burger option, ever. And guess what? If you’re a meat eater, these marinated and grilled portobello mushrooms make a great topper to a regular burger, too!

An open Marinated Portobello Mushroom Burger on a plate with chips, mayo, sliced tomato, and red onion rings on the side.

Tips for Buying Portobello Mushrooms

When buying portobello mushrooms, pay really close attention to the way they are priced. You’ll usually see them sold one or two ways: loose and priced per pound, or packaged in sets of two or three for a set price. Even though they are the exact same product, you might find a drastic price difference between the two options.

The loose mushrooms at my store today were $5.99 per pound. The packs or two mushrooms were sold for a set price of $3.99, but the package listed an approximate weight of 8oz., or 1/2 pound. So, if I had bought the packaged mushrooms I would have paid $2 more per pound. 🤯 I picked up two of the loose portobello caps and went on my way! :)

Do I Have to Grill These Marinated Portobello Mushroom Burgers?

While testing this recipe I also tested cooking them in a skillet and it worked quite well, although you won’t get those pretty grill marks. When cooking in a skillet, simply cook over medium heat, flipping the mushrooms occasionally, until they release all of their moisture and the liquid in the skillet has evaporated.

In addition to cooking these marinated portobello mushroom burgers on an outdoor grill, you can also use a grill pan, like in the step by step photos below. The cast iron grill pan I used fits right over the gas burners on the stove and has ridges on one side and a flat griddle on the other side. Here is a similar item on Amazon: Lodge Grill/Griddle Pan (affiliate link). A less expensive option would be a grill pan skillet, like this Lodge 10.5″ Square Grill Pan (affiliate link).

What to Serve on the Side

While you’ve got the grill going, grill up some vegetables for Grilled Vegetable Pasta Salad to serve on the side! Other great sides for these burgers include: Southern Style Potato Salad, Steak Fries, or a classic Creamy Coleslaw.

Close up side view of a marinated portobello mushroom burger topped with a slice of tomato and two red onion rings.

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Marinated Portobello Mushroom Burgers

5 from 19 votes
With their deep savory flavor, Marinated Portobello Mushroom Burgers are a fast and easy vegetarian option for summer grilling. 
Close up side view of a marinated portobello mushroom burger topped with a slice of tomato and two red onion rings.
Servings 2
Prep 5 mins
Cook 15 mins
Marinate Time 30 mins
Total 50 mins

Ingredients

  • 2 Tbsp olive oil ($0.08)
  • 2 Tbsp soy sauce ($0.12)
  • 1 Tbsp apple cider vinegar ($0.03)
  • 1 tsp brown sugar ($0.02)
  • 1/4 tsp oregano ($0.02)
  • 1/4 tsp garlic powder ($0.02)
  • 1/4 tsp onion powder ($0.02)
  • 1 tsp smoked paprika ($0.10)
  • freshly cracked pepper ($0.03)
  • 2 portobello mushroom caps (about 1/2 lb. total) ($2.94)
  • 2 buns ($0.83)

Optional Toppings

  • 1 cup spring mix ($0.32)
  • 1 tomato ($0.70)
  • 1/4 red onion, sliced into rings ($0.07)
  • 4 Tbsp mayonnaise ($0.40)

Instructions 

  • In a small bowl, stir together the olive oil, soy sauce, apple cider vinegar, brown sugar, oregano, garlic powder, onion powder, smoked paprika, and a little freshly cracked pepper (about 10 cranks of a pepper mill).
  • Remove the stems from the portobello mushrooms.* Place the mushrooms in a shallow dish, gill sides up. Pour some of the marinade into the gills, then flip the mushrooms and pour the rest over the top. Let the mushrooms marinate for 30 minutes, flipping occasionally.
  • Heat a grill or grill pan over medium to medium-high heat. Once hot, add the marinated portobello mushrooms and cook for about 7 minutes on each side, or until the mushrooms are soft and have released most of their liquid.
  • Build your marinated portobello mushroom burgers on a bun with your preferred toppings. I love the classic mix of mayonnaise, sliced tomato, onion rings, and lettuce or spring mix.

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Notes

*You can save the mushroom stems use them later in an omelette (chopped), or save with the rest of your vegetable scraps in the freezer for making vegetable stock later.

Nutrition

Serving: 1ServingCalories: 522.05kcalCarbohydrates: 39.3gProtein: 9.4gFat: 38.05gSodium: 1426.45mgFiber: 3.6g
Have you tried this recipe?Mention @budgetbytes or tag #budgetbytes on Instagram!

An open portobello mushroom burger on a plate with chips, a small dish of mayo and onion rings on the side.

How to Make Portobello Burgers – Step by Step Photos

Portobello mushroom burger marinade ingredients in a bowl

To make the marinade for the portobello mushroom burgers, combine 2 Tbsp olive oil, 2 Tbsp soy sauce, 1 Tbsp apple cider vinegar, 1 tsp brown sugar, 1/4 tsp oregano, 1/4 tsp garlic powder, 1/4 tsp onion powder, 1 tsp smoked paprika, and some freshly cracked pepper (maybe 10 cranks of a pepper mill) in a bowl. 

Marinate Portobello Mushrooms in a shallow dish

If the mushrooms have long stems, pull the stems off. Place the portobello mushrooms in a shallow dish, gill side up, and pour some of the marinade into the gills. Flip the mushrooms over and pour the rest of the marinade over top. 

Marinated Portobello Mushroom Caps

Marinate the mushrooms for 30 minutes, flipping them a few times throughout.

Grilled Marinated Portobello Mushroom Burgers on a grill pan with tongs.

Heat an outdoor grill, grill pan, or skillet over medium. Once very hot, add the marinated portobello mushrooms and cook on each side for about 7 minutes, or until the mushrooms are very soft and have released most of their moisture.

An open marinated portobello mushroom burger on a plate with chips, viewed from the front.

Then just build your burgers with your preferred toppings! I love a classic mix of mayo, lettuce or spring mix, and tomato and onion slices.

Marinated Portobello Mushroom Burger topped with tomato and onion on a plate with chips.

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  1. I loved this. It was really quick and easy, and I loved the flavor. I, unfortunately, do not have a grill or a grill pan, so I just put mine in a skillet, so it didn’t have the grill marks and likely cooked a bit differently than it would have on a grill, but it was still really delicious. The older I get, the more I realize that I don’t actually enjoy meat as much as I do vegetables, especially not poorly cooked meat. I find myself gravitating towards the vegetables in a stirfry rather than the chicken or beef, So to me, this portobello, while I can’t say it tastes quite like a burger, was delicious and had many o the same flavors, and it certainly sat much less heavy in my stomach than a burger would. I had mine with a garlic aioli I whipped up earlier spread on either side of the bun, mixed greens, red onion rings, and onion rings on the side (plus one onion ring on top.) Highly recommend it if this seems up your alley!

  2. Easy and delicious! I’m over ‘plant based meats’ and burgers, and just want to eat plants these days, and this totally hits the spot!! I cooked them on the barbeque, topped with a grilled thick slice of onion. I did two caps per adult, with creamy goat cheese between, mayo and Dijon on a bun. So extremely good and satisfying.

  3. Made these with a slight tweak to the marinate after reading other comments I added some steak spice to the mix omitted brown sugar and used an  immersion blender to mix the marinate  allowed the caps to marinate and turning caps every so often, and I found that I was able to grill gills down first made it easier to press later to get the char marks on cap better. 
    It smelled awesome cooking and tastes great. For the mayo I added some mustard it definitely didn’t taste like a mushroom smelled and tasted like a steak. I don’t like mushrooms at all but this tasted awesome we will be making it again my kids didn’t even notice it was a mushroom until we told them 

  4. We really like this recipe, but the marinade always seems a bit bitter after grilling. Any advice to mellow it out?

    1. Sugar is usually a good way to neutralize bitterness. So I would try increasing the brown sugar slightly. You may also want to check to make sure your olive oil hasn’t gone rancid, which can often cause a bitter flavor.

  5. After marinating, I prepared them in a skillet, beginning gill sides down. After flipping at 7 minutes, I dropped mini mozzarella balls atop the gills for the final 7 minutes. When done, I served them on toasted buns with the recommended fixings… Delicious! I’m not looking forward to the scrubbing I’ll have to do to clean the skillet, tho :/

  6. Amazing! Tastes like a steakhouse steak flavour wise! 10/10 if you have portabellas grab this in your belly!

  7. I want to add 1 slice of roasted eggplant, also marinated. And arugula (always arugula), regular butter on one and truffle butter on the other. Tomatoes on both, maybe topped with fleur de sel de Camargue on the truffle one, Maldon sea salt flakes on the regular butter one. Toast the cut side of the brioche buns that have been smeared with Kewpie mayonnaise. A little Dijon mixed into the mayo might be interesting, too.

  8. This marinade is delicious! I air fried my portabellos but can’t wait to try this on the grill when it warms up a bit. Thanks for a great recipe!

  9. I made these exactly as the recipe was written and they were easy and delicious! This is my new favorite burger recipe!! Thank you for sharing! 

  10. This tasted exactly like a burger..delicious!!! I would eat this for breakfast…it Sat very nicely on my tummy too…thank you for this incredible yet simple recipe!! To note..I used the exact ingredients the recipe called for..

  11. Definitely will be making this, again. Grilled the caps on an outdoor gas grill. Delicious on a warmed Kaiser roll w/ farm fresh red tomato slices, grilled sweet onion slices, and lettuce. Corn on the cobb gave us the perfect home picnic meal.

  12. I love portobello mushrooms, but this recipe was disgusting!  I did eat the mushroom, but threw everything else out!

  13. This is Excellent! Love the marinade. My kitchen smells so good after fixing this recipe😊