These portobello mushroom burgers are one of the most delicious vegetarian sandwiches you’ll ever have! Not only do they look like regular burgers, but they also have a similar texture and flavor.
The BEST Portobello Mushroom Burger Recipe
Even the biggest meat-heads out there will love these meatless burgers! The secret is the marinade for the mushrooms. It gives this precious fungus a meaty, savory flavor that is sure to make your mouth water.
And, of course, nothing goes with a burger quite like some tasty toppings! We kept it simple yet delicious with some red onions, pepper jack cheese, and a sauce made of ketchup and garlic hummus. But feel free to get creative and add your favorite toppings!
Why you’ll love it!
Makes the juiciest, most flavorful portobello burgers packed with plant-based goodness!
A super quick and easy vegetarian recipe.
A great way to get your non-veggie friends and family to try something different!
The marinade is out-of-this-world good.
Health Benefits of Portobello Mushroom Burgers
Portobello mushroom burgers are an easy and delicious way to enjoy the taste of beef without all the unhealthy saturated fat. Here are just a few of the reasons why you should consider eating portobellos instead of beef patties:
- High in fiber and low in calories: Portobello mushrooms are an excellent source of dietary fiber and have very few calories, making them a great choice for healthy living.
- Rich in vitamins & minerals: Portobellos are rich in B vitamins, zinc, magnesium, selenium, and potassium. All of these nutrients have been linked to various health benefits, such as boosting the immune system and reducing inflammation.
- Heart-healthy: Not only do portobellos contain no saturated fat, but they also contain compounds known as sterols that can help to reduce cholesterol levels and improve heart health.
- Delicious: Portobello mushrooms have a delicious, meaty taste and texture that will satisfy even the most discerning burger lover! They go great with any type of bun or condiment, so you can make your favorite kind of burger without compromising on flavor.
- Portobello mushrooms: use large mushrooms as they have a great earthy flavor and are just about burger patty size!
- Red onion: we used red onion as the burger topping for this recipe, but feel free to use your favorite burger toppings!
- Pepper jack cheese: a great melty cheese to go on top of the mushrooms. You can also use your favorite vegan cheese!
- Chopped greens: any kind will do. We recommend arugula, spinach, romaine, etc.
- Onion burger buns: we love the flavor that onion buns bring to the table! Use any kind of hamburger buns you like, though.
- Garlic hummus: you could get plain ol’ hummus, but garlic makes everything better!
- Ketchup: adds a layer of sweetness and tang that balances this burger out perfectly.
Grilled Portobello Mushrooms
If you love a portobello mushroom burger, you’ll love these grilled portobellos! Make them as a side or a main dish.
What’s In Our Homemade Mushroom Marinade?
Our grilled portobello mushroom marinade is quick, easy, and absolutely delicious! It’s the secret sauce to making these portobello mushroom burgers taste like the real deal. Here’s what’s in ’em:
- Worcestershire sauce
- Balsamic vinegar
- Lemon juice
- Olive oil
- Brown sugar
- Dijon mustard
Add all of the marinade ingredients to a large bowl and whisk to combine.
Dredge the mushrooms in the marinade a few times to coat them. Let the mushrooms marinate for 1 hour, flipping them halfway through.
Preheat the grill to 400ºF and clean the grill grates.
SEASON & GRILL ONIONS
Next, place the onion rounds on a plate, drizzle them with olive oil, and season them with salt and pepper.
When the grill is heated, transfer onions to the grill over indirect heat. Grill the onions for 10 minutes, flipping halfway.
Transfer the mushrooms cap side down on the grill over indirect heat. Grill the mushrooms for 3 minutes on the cap side, flip, then grill them for an additional 2 minutes.
Place a slice of cheese on the mushroom and close the grill for 1 minute, allowing the cheese to melt. Remove them from the grill.
While the mushrooms are cooking, combine the hummus and the ketchup in a bowl.
Now it’s time to put all this goodness together!
Place the bottom of the burger bun on a plate, and transfer ½ cup of the greens onto the bun. Top the greens with the mushroom patty, and top the patty with grilled onion rounds.
ADD SAUCE, SERVE + ENJOY
Lastly, slather the top bun with 2-3 tablespoons of the hummus sauce to finish the burger. Serve immediately. Enjoy!
Just because this is a portobello mushroom burger doesn’t mean it has to be boring! Here are some fun topping ideas to make your burger even more delicious:
- Avocado slices
- A fried egg
- Roasted peppers
- Caramelized onions
- BBQ sauce
- Sliced jalapeños
- Dijon mustard
Store any leftover portobello mushrooms in an airtight container in the fridge for up to 3 days.
You want to store the mushrooms separately from the toppings so that the mushrooms don’t get soggy. The toppings can go in smaller airtight containers or Ziploc bags.
Can I freeze my portobello mushroom burgers?
We don’t recommend freezing portobello mushroom burgers, as the texture will be compromised when you thaw and reheat. We recommend making fresh burgers each time!
Portobello Mushroom Burgers
- 1 tablespoon Worcestershire sauce
- 2 tablespoons balsamic vinegar
- 2 tablespoons fresh lemon juice
- 3 tablespoons olive oil
- 3 garlic cloves peeled and minced
- 1 tablespoon grated onion
- 1 teaspoon light brown sugar
- 1 teaspoon Dijon mustard
- 4 large portobello mushrooms destemmed, rinsed, and dried
- ½ teaspoon kosher salt
- 1 large red onion sliced into rounds
- 1 tablespoon olive oil
- 1 teaspoon kosher salt
- 4 sliced pepper jack cheese
- 2 cups chopped greens arugula, spinach, romaine, etc.
- 4 sweet onion burger buns
- ½ cup garlic hummus
- ½ cup ketchup
- Add all of the marinade ingredients to a large bowl and whisk to combine.
- Dredge the mushrooms in the marinade a few times to coat them. Let the mushrooms marinate for 1 hour, flipping them halfway through.
- Preheat the grill to 400ºF and clean the grates.
- Place the onion rounds on a plate and drizzle them with olive oil and season them with salt and pepper.
- When the grill is heated, transfer onions to the grill over indirect heat. Grill the onions for 10 minutes, flipping halfway.
- Then, transfer the mushrooms cap side down on the grill over indirect heat. Grill the mushrooms for 3 minutes on the cap side, flip, and grill them for an additional 2 minutes.
- Place a slice of cheese on the mushroom and close the grill for 1 minute, allowing the cheese to melt. Remove them from the grill.
- While the mushrooms are cooking, combine the hummus and the ketchup in a bowl.
- Assemble the burgers. Place the bottom of the burger bun on a plate, and transfer ½ cup of the greens onto the bun. Top the greens with the mushroom patty, and top the patty with grilled onion rounds.
- Lastly, slather the top bun with 2-3 tablespoons of the hummus sauce to finish the burger. Serve immediately.
Tips & Notes
- Be sure to find large portobello mushrooms.
- You can use your favorite burger fixings in place of our burger fixings.
Photography: photos taken in this post are by Ashley McGlaughlin from The Edible Perspective.