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    Gastronotherapy » Recipes » Brunch

    Portobello Mushroom Sandwich with Ranch Slaw

    Published: Mar 22, 2021 · Modified: May 22, 2023 by MaryAnne · 14 Comments

    Jump to Recipe Print Recipe

    Meaty, juicy, savory, and crunchy, this portobello mushroom sandwich can be enjoyed by vegetarians and meat-eaters alike. Hearty portobello mushrooms are sauteed and topped with smashed avocado and a zippy and zesty ranch slaw. Satisfy your burger cravings in just 30 minutes with this healthy and delicious alternative.

    portobello mushroom sandwiches arranged on a cutting board.

    Mushrooms are one of my all-time favorite foods. I love their meaty texture and deep umami flavor, but they're also excellent at absorbing flavor, so you can use them in a variety of cuisines, like in my vegetarian fajitas or vegetarian sloppy joes.

    In this portobello mushroom sandwich recipe, we create an epic veggie sandwich full of flavors and textures that any meat-eater would enjoy. For more vegetarian sandwiches, try my garlic bread grilled cheese or french onion grilled cheese.

    Jump to:
    • ⭐️ Why This Sandwich is the Best
    • 🍄 Preparing Portobello Mushrooms
    • 🥪 Ingredient Notes
    • 📝 Variations & Substitutions
    • 🔪 How to Make a Portobello Mushroom Sandwich
    • 👩🏼‍🍳 Expert Tips
    • 💬 Frequently Asked Questions
    • 🍽 Related Posts
    • Portobello Mushroom Sandwich Recipe

    ⭐️ Why This Sandwich is the Best

    • Meaty and juicy vegetarian sandwich topped with a crunchy and zingy ranch coleslaw
    • Healthy mushroom burger that's full of antioxidants, B vitamins, fiber, potassium, and selenium (read more about the excellent reasons to eat mushrooms). It can easily be made vegan or gluten-free (see substitutions below).
    • Quick & easy meal that's ready in 30 minutes
    • Customizable sandwich that be finished with your favorite sandwich toppings
    • Versatile mushroom burger that can be baked in the oven or cooked on the grill (see variations below)
    • Perfect for summer cookouts or bbq's

    🍄 Preparing Portobello Mushrooms

    When using portobello mushrooms, make sure that you wipe them clean with a paper towel to remove any dirt. DO NOT WASH THEM WITH WATER. Mushrooms contain a lot of water, so adding more water will turn them soft and mushy.

    The stems are edible but they do have a woody and fibrous texture, so some folks prefer to remove them. This is totally optional for this recipe. Similarly, the gills are also edible, but some people remove them because of the texture when cooked.

    🥪 Ingredient Notes

    Recipe ingredients arranged on a table.
    • Portobello mushrooms - Large, meaty variety of mushrooms that are dark brown in color. They are considered the "mature" version of cremini mushrooms with a deeper flavor and have numerous health benefits.
    • Mayonnaise - this is the base for our tangy slaw; it adds a creamy tanginess
    • Buttermilk - adds even more tangy flavor
    • White wine vinegar - adds zippy flavor; apple cider vinegar will work as well
    • Garlic - I recommend using fresh garlic for the best flavor
    • Ranch slaw seasoning: The seasoning for our ranch coleslaw is a mixture of dried dill, dried parsley, dried chives, onion powder and garlic powder.
    • Shredded carrots and cabbage - Adds fresh flavor, crunch, nutrition, and a pop of color
    • Hamburger buns - Use a sturdy type of bun or roll to help soak up all of the juiciness of the sandwich. Brioche buns, pretzel rolls, or ciabatta rolls all work great.

    📝 Variations & Substitutions

    • Make it vegan: Substitute with a vegan mayonnaise and omit the buttermilk completely, or skip the coleslaw altogether and top your burger with guacamole, pickles, or ketchup instead.
    • Gluten-free: Use gluten-free hamburger buns or turn your sandwich into a wrap using lettuce leaves.
    • Bake mushrooms: Instead of cooking on the stove top, bake your mushrooms in the oven for more of a roasted flavor. Preheat oven to 350 degrees F. Brush mushrooms with olive oil and place gill side up into a baking dish. Bake for 15 minutes, until tender.
    • Grill mushrooms: Brush mushrooms with olive oil and place on the grill for around 10 minutes, flipping frequently.
    • Cook your mushrooms using an air fryer. Preheat fryer to 375 degrees F. Lightly brush mushrooms with olive oil and place gill side up in fryer. Cook for 7-10 minutes, until tender.
    • Make it a double. For a heartier sandwich, use 2 mushrooms per sandwich.
    White hand holding up mushroom sandwich topped with slaw.

    🔪 How to Make a Portobello Mushroom Sandwich

    Make the mushrooms:

    Wipe the mushrooms clean and remove the tough stems. Preheat a large skillet to medium heat, and add olive oil to skillet.

    Hand wiping portobello mushrooms clean with a paper towel.

    Working in two batches, sprinkle 2 mushrooms with a pinch of salt and place into skillet with gills facing up. Cook 4-5 minutes, then flip over and cook for an additional 5 minutes, until the mushrooms are firm-tender. Repeat with the remaining 2 mushrooms.

    Mushrooms placed in skillet gill side up.
    Cooked mushrooms flipped over in skillet.

    Make the ranch slaw:

    Meanwhile, in a medium bowl, whisk together mayonnaise, buttermilk, vinegar, dill, parsley, chives, onion powder, garlic powder, and salt. Add shredded carrots and cabbage and stir until both are completely covered in sauce.

    Ranch slaw mixed together in a mixing bowl.

    Assemble sandwiches:

    To assemble sandwiches, smash ¼ of avocado (if using) on top half of a hamburger bun. Place cooked mushroom on bottom half of bun and add a generous scoop of the slaw on top. Serve immediately.

    Assembled sandwich on a gray plate with kale chips.

    👩🏼‍🍳 Expert Tips

    • Storage: Place mushrooms in an airtight container and store in the refrigerator for up to 4 days.
    • Serve sandwiches with corn on the cob, mashed potatoes, vegetarian baked beans, or sweet potato fries.
    • Removing mushroom stem is optional. It does have a woody and fibrous texture, but it is edible.
    • Wipe mushrooms clean. Be sure to use a dry towel or paper towel to clean your mushrooms. Do not wash with water, as this will turn the mushrooms soft and mushy.
    • Serve with your favorite toppings and condiments. You can skip the slaw altogether and use mayo, mustard, lettuce, tomato, or basil aioli instead.

    💬 Frequently Asked Questions

    Is it ok to eat the gills of a portobello mushroom?

    The gills of a portobello mushroom are totally edible. However, some people prefer to remove them due to their appearance and texture when cooked.

    Are portabella mushroom caps healthy?

    Besides being an excellent source of plant-based protein, mushrooms are nutrition powerhouses. Loaded with fiber and antioxidants, they are a great source of B vitamins, potassium, and selenium (read more about the excellent reasons to eat mushrooms).

    🍽 Related Posts

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      Garlic Bread Grilled Cheese
    • Vegetarian sloppy joes arranged on a cutting board.
      Vegetarian Sloppy Joes
    • creamy avocado gazpacho in a white bowl.
      Creamy Cucumber Avocado Gazpacho
    • Zucchini and corn fritters arranged on parchment paper with a cup of sauce.
      Crispy Zucchini and Corn Fritters

    Tried this recipe? Please leave a star ⭐️⭐️⭐️⭐️⭐️ rating below and/or a review in the comments section further down the page. You can also stay in touch with us through social media by following us on Instagram, Pinterest, and Facebook.

    Subscribe to my email newsletter to get my FREE Guide on Money Saving Tips on Buying Groceries, and get new recipes delivered to your inbox!

    portobello mushroom sandwiches arranged on a cutting board.

    Portobello Mushroom Sandwich Recipe

    Author: MaryAnne
    Meaty, juicy, savory, and crunchy, this portobello mushroom sandwich can be enjoyed by vegetarians and meat-eaters alike. Hearty portobello mushrooms are sauteed and topped with smashed avocado and a zippy and zesty ranch slaw. Satisfy your burger cravings in just 30 minutes with this healthy and delicious alternative.
    5 from 7 votes
    Print Recipe Pin Recipe
    Prep Time 5 minutes mins
    Cook Time 20 minutes mins
    Total Time 25 minutes mins
    Course Main Course
    Cuisine American
    Servings 4 sandwiches
    Calories 358 kcal

    Ingredients
      

    For the mushrooms:

    • 4 large portobello mushrooms, wiped clean and stems removed
    • 2 Tablespoons olive oil

    For the coleslaw:

    • ⅓ cup mayonnaise
    • ¼ cup buttermilk
    • 2 teaspoons white wine vinegar
    • ½ teaspoon dried dill
    • ¼ teaspoon dried parsley
    • ½ teaspoon dried chives
    • ½ teaspoon onion powder
    • ½ teaspoon garlic powder
    • ½ teaspoon sea salt
    • 1 ½ cups shredded carrots
    • 1 ½ cups shredded cabbage

    For the sandwiches:

    • 4 hamburger buns, sliced
    • 1 avocado, sliced and pitted (optional)

    Instructions
     

    Make the mushrooms:

    • Wipe the mushrooms clean and remove the tough stems. Preheat a large skillet to medium heat, and add olive oil to skillet.
    • Working in two batches, sprinkle 2 mushrooms with a pinch of salt and place into skillet. Cook 4-5 minutes, then flip over and cook for an additional 5 minutes, until the mushrooms are firm-tender. Repeat with the remaining 2 mushrooms.

    Make the ranch slaw:

    • Meanwhile, in a medium bowl, whisk together mayonnaise, buttermilk, vinegar, dill, parsley, chives, onion powder, garlic powder, and salt. Add shredded carrots and cabbage and stir until both are completely covered in sauce.

    Assemble sandwiches:

    • To assemble sandwiches, smash ¼ of avocado (if using) on top half of a hamburger bun. Place cooked mushroom on bottom half of bun and add a generous scoop of the slaw on top. Serve immediately.

    Notes

    • Storage: Place mushrooms in an airtight container and store in the refrigerator for up to 4 days.
    • Serve sandwiches with corn on the cob, mashed potatoes, or japanese sweet potato fries.
    • Removing mushroom stem is optional. It does have a woody and fibrous texture, but it is edible.
    • Wipe mushrooms clean. Be sure to use a dry towel or paper towel to clean your mushrooms. Do not wash with water, as this will turn the mushrooms soft and mushy.
     

    Nutrition

    Calories: 358kcalCarbohydrates: 33gProtein: 8gFat: 24gSaturated Fat: 4gPolyunsaturated Fat: 10gMonounsaturated Fat: 9gTrans Fat: 0.04gCholesterol: 9mgSodium: 684mgPotassium: 611mgFiber: 4gSugar: 9gVitamin A: 8510IUVitamin C: 17mgCalcium: 118mgIron: 2mg
    Tried this recipe?Let us know how it was!

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    Reader Interactions

    Comments

    1. Barb Haner

      March 22, 2021 at 12:01 pm

      5 stars
      Another healthy recipe to try to go along with spring!

      Reply
      • Gastronotherapy

        March 22, 2021 at 12:54 pm

        Absolutely!

        Reply
    2. Julia

      March 22, 2021 at 12:39 pm

      I love mushroom burgers! I will definitely be trying this one. 😉

      Reply
      • Gastronotherapy

        March 22, 2021 at 12:55 pm

        Yay! Let me know how they turn out!

        Reply
    3. Beth

      June 06, 2021 at 8:15 am

      5 stars
      Oh wow! These burgers are so delicious and very tasty! My hubby and daughter love mushrooms, and these were perfect for dinner the other night!

      Reply
      • Gastronotherapy

        June 06, 2021 at 3:03 pm

        Thanks, Beth! So glad they were a hit! 🙂

        Reply
    4. Sandhya

      June 06, 2021 at 9:42 am

      5 stars
      Love this mushroom burger to serve with chips and coleslaw.... I cannot wait to make it for the BBQ weekend

      Reply
      • Gastronotherapy

        June 06, 2021 at 3:04 pm

        It's perfect for a bbq weekend! 🙂

        Reply
    5. Heidy

      June 06, 2021 at 10:51 am

      5 stars
      Portobello Burgers with Smoky Ranch Slaw has to be one of new favorite recipe combos! I loved the flavor and will be definitely be on our menu this summer.

      Reply
      • Gastronotherapy

        June 06, 2021 at 3:06 pm

        Yay! So happy to hear that, Heidy!

        Reply
    6. Bintu | Budget Delicious

      June 06, 2021 at 11:44 am

      5 stars
      I adore Portobello mushrooms and these sound like the most delicious burgers, especially with that smoky ranch slaw! What a tasty meal.

      Reply
      • Gastronotherapy

        June 06, 2021 at 3:07 pm

        Thanks, Bintu! Yes - the smoky ranch slaw is sooooo tasty!

        Reply
    7. Biana

      June 06, 2021 at 12:16 pm

      5 stars
      Portobello burgers looks awesome! Such a perfect healthy summer burger.

      Reply
      • Gastronotherapy

        June 06, 2021 at 3:08 pm

        Thanks, Biana! Yes - they are my go-to in the summer when I want a lighter and healthier burger option!

        Reply

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    MaryAnne from Gastronotherapy

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