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portobello mushroom burger

Portobello Mushroom Burger

  • Author: Candice
  • Prep Time: 15 minutes
  • Cook Time: 10 minutes
  • Total Time: 25 minutes
  • Yield: 4 1x
  • Diet: Vegan


This vegan Portobello Mushroom Burger is so delicious that you will forget it’s actually healthy! Paired with vegan garlic aioli and fresh toppings, you will have a family favorite.



For the Portobello Steak

  • 4 large portobello mushrooms, cleaned and gills removed
  • 3 TBSP balsamic vinegar
  • 3 TBSP vegan Worcestershire sauce
  • 1 TBSP olive oil
  • 2 garlic cloves, minced
  • 1 tsp onion powder
  • salt and pepper to taste

For the Burgers

  • 4 buns
  • toppings of your choice: tomatoes, lettuce, onion, avocado, sprouts, ect…

For the Vegan Garlic Aioli

  • 1 cup cashews, soaked
  • 1/2 cup water
  • 2 tsp dijon mustard
  • 4tsp lemon juice, about 1/2 a lemon
  • 3 garlic cloves, roughly chopped
  • 1/4 tsp salt


For the Portobello Steak

  1. Mix the balsamic vinegar, Worcestershire sauce, olive oil, garlic and onion powder together in a bowl.  Please the mushrooms in a large zip lock back or a shallow dish, add the marinade and let sit for at least 5 minutes.
  2. Over high heat (either in a pan or on grill) cook the mushrooms for about 4 minutes each side.  If using a grill, spray with some oil so they do not stick. 
  3. When heated through, remove and they’re ready to serve.

For the vegan garlic aioli

  1. Soak the cashews in hot water for at least 5 minutes.
  2. Place the cashews and 1/2 cup water, mustard, lemon juice, garlic and salt in a blender and pulse for 30 seconds.  Stop, scrapping down sides, taste and add more lemon or mustard if necessary.  Pulse for another 30 – 60 seconds until reached a creamy texture.


  • Put the aioli on the toasted buns, add the portobello steak patties, top with your choice of toppings and enjoy!  Best served while still hot!



If you want a link for just the Vegan Garlic Aioli, you can find it here: Easy Vegan Garlic Aioli

The mushrooms steaks will keep in the fridge for about 3 days.

Nutritional content includes bun, garlic aioli and toppings as shown pictured.

Please let me know if you make these and what toppings you used! Make sure to PIN for easy reference.

  • Category: easy
  • Method: grill
  • Cuisine: american

Keywords: vegan, portobello, garlic aioli, quick, easy, dinner