Portabella Mushroom Sandwich (Vegan!)

This utterly delicious Portabella Mushroom Sandwich recipe features tender mushrooms, roasted red pepper, fresh arugula, and a homemade garlic aioli sauce. Incredibly flavorful & satisfying! (Vegan, with gluten-free & oil-free options.)

I'm so excited to share this portabella mushroom sandwich recipe! It's an utterly delicious, crave-worthy meatless meal.

First we'll roast tender mushroom slices in a savory, smoky marinade. Then layer them on toasted bread with roasted red peppers and fresh, peppery arugula. And finally top it off with a creamy homemade garlic aioli sauce. (Yes!)

The result is juicy, succulent, sandwich perfection... filled with truly amazing flavors. I hope you enjoy it as much as I do!

Ingredients for Portabella Sandwich

For this recipe you'll need:

• Portabella mushrooms: (Also spelled Portobello mushrooms.) You'll need about 14-16 ounces fresh mushrooms for this recipe, which is about 4 large portabella caps. We'll wipe them clean with a damp paper towel to remove any dirt, then cut them in strips. Then toss them in a savory marinade and roast in the oven to tender, juicy perfection! (They're so good.)
• Tamari: Or you can substitute soy sauce, but use tamari for a gluten-free option.
• Balsamic vinegar
• Vegan Worcestershire sauce: Traditional Worcestershire sauce includes anchovies, but there are many vegan options now. Most often, I use the Whole Foods brand which is vegan, gluten-free, and oil-free. But simply leave it out if you can't find it.
• Smoked paprika: This adds warm, smoky flavor to the mushroom mixture.
• Onion powder & garlic powder
• Aioli sauce: I use my oil-free Vegan Garlic Aioli for this recipe. It's so creamy, flavorful, and really takes this sandwich to the next level! It's made with simple, wholesome ingredients like cashews, lemon juice, Dijon mustard, and garlic cloves.
• Roasted red pepper: For convenience, I use jarred roasted peppers. But you can roast your own from scratch if desired.
• Fresh baby spinach or arugula: Or substitute other mixed greens or lettuce. Baby arugula is great for a peppery bite.
• Bread or sandwich buns: Most often I use lightly toasted sourdough bread. Be sure to use gluten-free bread if needed. (Or try it as a wrap with your favorite large tortillas!)

Customizing

Vegetables: Include other veggies as you see fit! Add other roasted vegetables like zucchini and red onions, caramelized onions, tomatoes, avocado, sprouts, etc.

Sauce: Instead of the garlic aioli, you can try Cashew Mayo (or other mayonnaise), Chipotle Crema, Walnut Pesto, Hummus, Vegan Big Mac Sauce, or Thousand Island Dressing.

Make it cheesy: Add your favorite dairy-free cheese to your sandwiches. Vegan feta cheese, mozzarella, or cheddar would be great.

Grilled: Instead of lightly toasting your bread, finish this sandwich on a grill pan or use a panini press.

For more inspiration, also browse all vegan sandwich recipes or mushroom recipes.

Portabella Mushroom Sandwich (Vegan!)

This utterly delicious portabella sandwich features tender mushrooms, roasted red pepper, fresh arugula, and a homemade garlic aioli sauce. It's incredibly flavorful & satisfying!

5 from 4 votes

Print Recipe Pin Recipe Comment

Prep Time: 15 minutes minutes

Cook Time: 25 minutes minutes

Total Time: 40 minutes minutes

Author: Kaitlin - The Garden Grazer

Course: Main Dish

Cuisine: Gluten-Free Option, Oil-Free Option, Vegan

Servings: 4 sandwiches

US CustomaryMetric

Ingredients

For the savory roasted mushrooms:

• 14 oz. portabella mushrooms (about 4 large caps, stems removed)
• 1 Tbsp. + 1 tsp. tamari
• 1 Tbsp. balsamic vinegar
• 1 Tbsp. water
• 1 tsp. vegan Worcestershire sauce
• 1 tsp. smoked paprika
• 1/2 tsp. onion powder
• 1/2 tsp. garlic powder

For the rest:

• 1/2 cup Vegan Garlic Aioli (or more to taste)
• 2 cups fresh baby arugula (or spinach)
• 2-3 large roasted red peppers
• 8 slices bread (or 4 sandwich buns)

Instructions

• Preheat oven to 425°F (220°C). Line a rimmed baking sheet with parchment paper. Set aside.
• In a large mixing bowl, add tamari, balsamic vinegar, water, Worcestershire sauce, smoked paprika, onion powder, and garlic powder. Stir well to combine.
• Clean mushrooms and slice into 1/2" strips. Then add them to the large bowl and gently toss with a spatula to coat with the marinade. (It's okay if some mushrooms break.)
• Lay out the marinated mushrooms single file on your lined baking sheet. (Feel free to spoon any leftover marinade over the top of the mushrooms on the sheet.) Bake for 25 minutes or until desired tenderness.
• Assemble sandwiches: Lightly toast your bread if desired. Then spread about 1 Tbsp. aioli, or more, on each slice of bread. (Spreading it on both sides acts as a helpful "glue" holding the sandwich together.) Then on one slice, layer some mushroom strips, 1/2 cup arugula, and some roasted red pepper. Place your other bread slice on top.

Notes

Yield: This makes about 4 sandwiches, but you may find it's more or less depending on the size of your bread.

Gluten-free option: Use your favorite GF bread. (Or try it as a wrap with GF tortillas.)

Oil-free option: Ensure your bread and Worcestershire sauce is oil-free. As of this writing, both Ezekiel brand and Dave's "Good Seed" bread do not include oil.

Nutrition Per Serving (Estimate)

Nutrition Facts

Portabella Mushroom Sandwich (Vegan!)

Amount per Serving

Calories

284

% Daily Value*

Fat

 

10

g

15

%

Saturated Fat

 

1

g

6

%

Trans Fat

 

0.02

g

Polyunsaturated Fat

 

2

g

Monounsaturated Fat

 

4

g

Potassium

 

666

mg

19

%

Carbohydrates

 

39

g

13

%

Fiber

 

5

g

21

%

Sugar

 

8

g

9

%

Protein

 

12

g

24

%

Vitamin A

 

584

IU

12

%

Vitamin C

 

13

mg

16

%

Calcium

 

113

mg

11

%

Iron

 

4

mg

22

%

* Percent Daily Values are based on a 2000 calorie diet.

Sodium content: This is omitted as I cannot provide an accurate number. I encourage you to calculate your own to provide a much more precise reading based on the exact ingredients, brands, and amounts you're using.

Get the Monthly NewsletterSubscribe here!

If you're enjoying this vegan Portobello Mushroom Sandwich recipe with garlic aioli, also check out:

• BBQ Ranch Tempeh Wrap
• Avocado Veggie Sandwich
• Curried Chickpea Salad
• TLT Sandwich with Tempeh Bacon

Follow The Garden Grazer on Instagram, Pinterest, X (Twitter), or Facebook for more updates and inspiration.