This Low Calorie Portobello Mushroom Burgers is just 343 calories! It’s also quick cook and prep time, and you can cook these portobello mushroom recipes 4 ways. Find these healthy recipes for portobello burgers below, along with lots of tips, tricks, and shortcuts to get dinner on the table right away.

The Best Portobello Mushroom Burger Recipe

Ingredients You’ll Need:

2 large portobello mushrooms
Olive oil spray
1 teaspoon Homemade Seasoning Salt
½ red onion
½ avocado
1 teaspoon lime juice
2 vegan burger buns or your favorite
1 medium tomato
½ cup baby spinach or your favorite greens
Mustard and Ketchup optional- for serving

Low Calorie Portobello Mushroom Burgers

Healthy Portobello Mushroom Burgers Meal Prep and Storage

Meal Prep: These are really best fresh, but you can clean the mushrooms, prep the toppings you are choosing, etc ahead of time.
Storage: Will hold for 2 days in the fridge (may get soggy, so 1 day is ideal), does not do well in the freezer.

Low Calorie Portobello Mushroom Burgers

More Yummy Low Calorie Recipes:

Low Calorie Portobello Mushroom Burgers

Lose Weight By Eating

This vegan portobello mushroom burger recipe is just 343 calories!

We've also supplied you with directions on cooking portobello burgers on the grill, in the oven, stovetop, and even on the air fryer!

This delicious portobello recipe makes a great dinner or lunch, and can easily be made gluten-free with your favorite GF burger buns!

5 from 1 vote

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Prep Time 5

Cook Time 10

Total Time 15

Course dinner, lunch, Main Course

Cuisine American

Servings servings

Calories 343 kcal

Ingredients

2 large portobello mushrooms
1 teaspoon Homemade Seasoning Salt
Olive oil spray
½ red onion
½ avocado
1 teaspoon lime juice
2 vegan burger buns or your favorite
1 medium tomato sliced
½ cup baby spinach or your favorite greens
Mustard and Ketchup optional- for serving

Instructions

How to Make Portobello Burgers on the Grill:

Preheat the grill to medium heat.
Remove the stems from the portobello mushrooms, and clean the caps with a damp cloth or paper towel.
Slice the onion into 2 rings.
Spray the mushrooms and onions with olive oil. And sprinkle all over with seasoning salt.
Add the mushrooms to the hot grill, gill side up (cut side up). And add the onions alongside them.
Cook 7 minutes, flip and cook for an additional 5-7 minutes, until the mushrooms are tender and the onions are soft.
Meanwhile, add the avocado and lime juice to a medium bowl. Smash with the back of a fork until spreadable.
Add 1/2 of the smashed avocado to the bottom of each bun. Top each with the cooked portobellos, then the tomato, grilled onions, and spinach.
Add ketchup, mustard, or your favorite burger sauce, and serve hot.
Special Tip- I like to toast the buns, if you're using a BBQ to make these mushroom burgers you can just add them cut side down on the grill for the last minute or so… watch them so they don't burn!

How to Cook Portobello Burgers in the Oven:

Preheat the oven to 375 degrees and spray a baking sheet with olive oil.
Remove the stems from the portobello mushrooms, and clean the caps with a damp cloth or paper towel.
Slice the onion into 2 rings.
Add the mushrooms (cut side down) and onions to the prepared baking sheet and sprinkle with seasoning salt.
Bake for 20 minutes, until the mushrooms are tender and the onions are soft.
Meanwhile, add the avocado and lime juice to a medium bowl. Smash with the back of a fork until spreadable.
Add 1/2 of the smashed avocado to the bottom of each bun. Top each with the cooked portobellos, then the tomato, grilled onions, and spinach.
Add ketchup, mustard, or your favorite burger sauce, and serve hot.
Special Tip- I like to toast the buns, if you're baking these mushroom burgers you can just add them, cut side up on a clean baking sheet for the last 1-3 minutes.

How to Make Portobello Burgers on the Stovetop:

Preheat a grill pan or large skillet over medium heat.
Remove the stems from the portobello mushrooms, and clean the caps with a damp cloth or paper towel.
Slice the onion into 2 rings.
Spray the mushrooms and onions with olive oil. And sprinkle all over with seasoning salt.
Add the mushrooms to the hot pan, gill side up (cut side up). And add the onions alongside them.
Cook 7 minutes, flip and cook for an additional 5-7 minutes, until the mushrooms are tender and the onions are soft.
Meanwhile, add the avocado and lime juice to a medium bowl. Smash with the back of a fork until spreadable.
Add 1/2 of the smashed avocado to the bottom of each bun. Top each with the cooked portobellos, then the tomato, grilled onions, and spinach.
Add ketchup, mustard, or your favorite burger sauce, and serve hot.
Special Tip- I like to toast the buns, if you're using a grill pan or skillet to make these mushroom burgers you can just start by toasting the buns, cut side down in the pan for 2-3 minutes or so… then begin cooking the rest. As a bonus, they will crunch up a little more while they cool.

How to Cook Portobello Burgers in the Air Fryer:

Preheat the air fryer to 370 degrees.
Remove the stems from the portobello mushrooms, and clean the caps with a damp cloth or paper towel.
Slice the onion into 2 rings.
Spray the mushrooms and onions with olive oil. And sprinkle all over with seasoning salt.
Carefully add the mushrooms to the hot air fryer, cut side down. And add the onions alongside them.
Air fry for 7 minutes, the mushrooms will be tender and the onions soft.
Meanwhile, add the avocado and lime juice to a medium bowl. Smash with the back of a fork until spreadable.
Add 1/2 of the smashed avocado to the bottom of each bun. Top each with the cooked portobellos, then the tomato, grilled onions, and spinach.
Add ketchup, mustard, or your favorite burger sauce, and serve hot.
Special Tip- I like to toast the buns, you can do this in the oven. Add cut side up to a clean baking sheet and bake for 1-3 minutes at 375 degrees.

Nutrition

Serving: 1burgerCalories: 343kcalCarbohydrates: 39.4gProtein: 10.8gFat: 17.2gSaturated Fat: 3.6gCholesterol: 5mgSodium: 1654mgPotassium: 400mgFiber: 8.5gSugar: 8.3gCalcium: 24mgIron: 2mg

Keyword burgers, mushroom, vegan

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About the Author

Hi, my name is Audrey Johns and I am a 4 time best selling cookbook author! All 4 of my low calorie cookbooks are published by HarperCollins (the oldest publishing house in the US!) and have been featured on prominent TV shows like The Today Show, Rachael Ray and The Doctors. I am a low calorie and healthy recipe authority and my delicious recipes are tried and loved by thousands of readers.

After a one year 150 pound weight loss (and I’ve kept it off for 13 years!) I started sharing all of my low calorie recipes with the world. They are always all-natural and geared around weight loss and weight management. I have even made some of these recipes with my Biggest Loser pal Bob Harper! Check out my weight loss story, my best selling cookbooks, and my numerous TV appearances by clicking here.