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    Home » Recipes » Slow Cooker Meals

    Portobello Mushroom Sandwich

    Published: Jan 5, 2018 · Modified: Aug 27, 2021 by Bowl Me Over · 28 Comments

    This Portobello Mushroom Sandwich is the BEST! Big, rich and meaty this vegetarian burger will make you a believer of a meatless meal! It can be made in the slow cooker or Instant Pot and it's super easy.
    Jump to Recipe Print Recipe

    Portobello Mushroom Sandwich - Do you love a great sloppy-joe but want to lighten up your meal? This Portobello Mushroom Sandwich  is the easiest and most delicious sandwich. Cooked in the slow cooker or Instant Pot (works for either!) It takes ten minutes in prep and it's hands off after that.

    Next time try Sautéed Portobello Mushrooms!

    Close-up picture of a sandwich. The bottom bun is topped with lettuce, portobello mushroom, red peppers and onions. The sandwich is topped with crunchy coleslaw and finished off with a big bun on top.

    No one will miss the meat with this big meaty Portobello Mushroom Sandwich!

    This vegetarian meal was inspired by our visit to Hawaii a couple years ago. This is a blog I released two years ago. As I was updating the recipe and pictures, I realized many of the pictures are worth sharing again, so enjoy!

    I did promise you a recipe today and that recipe is for a delicious Portobello Mushroom Sandwich. This sandwich was inspired by our visit to Hawaii. When we are there, we often stay in Waimanalo which is on the eastern side of Oahu. It's the most picturesque beach I've ever seen.

    Waimanalo Beach

    Waimanalo Beach

    Miles of gorgeous beach. We usually have the beach to ourselves! Absolutely breathtaking beauty!

    In the city of Waimanalo there is a tiny little five star vegan restaurant. Here we discovered the most amazing food! 'Ai Love Nalo keeps sparse hours and always has a line out the door. The food is spectacular! This blog was first released two years ago. Since then every time we visit Hawaii, we dine at this restaurant.

    We enjoyed a couple of meals there and a favorite is the Mushroom Burger - hands down the most fantastic burger (beef, chicken or vegan) that I've ever eaten. I've done my best since we came home to replicate that burger!

    Mushroom Burger

    Portobello Mushroom Sandwich

    And I might add...I've came pretty close (Dan says it's better!) ! This burger is slow cooked with mushrooms, red onions and bell peppers. I've tried making my own bbq sauce and also using my favorite store bought sauce and you know what? Either way it's equally as delicious so why not make it easy on yourself and just use store bought?

    This meal can be made in the slow cooker or Instant Pot. While it is cooking make the coleslaw and toast your burger buns. That's it!

    A burger bun topped with lettuce, portobello mushroom, onions and peppers in barbecue sauce.

    When you plate the Portobello Mushroom Sandwich, position the mushroom stem side up. It creates a bowl to hold the sliced mushrooms, peppers and onions.

    Portobello Mushroom Sandwich - Shopping List

    • portobello Mushrooms
    • sliced Mushrooms
    • red onion
    • red bell pepper
    • bbq sauce
    • fixings for coleslaw (or pre-made from the Deli department)
    Here are the steps!

    Here are the steps!

    Here are the steps -

    • clean the mushrooms, put them in the slow cooker
    • add the sliced peppers and onions
    • top with bbq sauce and spice. Stir to combine.
    • toast the burger buns because this is an oozy-gooey burger and toasting the bun keeps it from getting soggy.

    Mushroom_BurgerV

    Now that burger we had at 'Ai Love Nalo was pretty fabulous and I have to say, I've worked to make this recipe comparable and my hubby say I nailed it! Topless Burger

    When you assemble the burger, place the portobello on the bun first stem side up. Placing it with the stem side up creates a natural bowl for the sliced mushrooms, peppers and onions and keeps them from sliding off - then top it off with a big dollop of cole slaw!

    A burger bun topped with lettuce, portobello mushroom, onions and peppers. There's a spoonful of coleslaw being placed on the top.

    Top each sandwich with a dollop of coleslaw.

    Portobello Mushroom Sandwich - Tips

    • toast or grill the bread (keeps it from getting soggy)
    • remove the gills from the portobello mushrooms
    • place the portobello mushroom on the bun first, stem side up - this creates a natural bowl for the sliced mushrooms, peppers and onion
    • can be made in the instant pot

    Read about more of our adventures here - Family Fun Night with the Oakland A's and our visit to Mesa Verde National Park

    Portobello mushrooms give it that big steak flavor and making it in your slow cooker is super easy. This Portobello Mushroom Sandwich is big, meaty, hearty and most of all delicious!

    If you love this recipe as much as I do, please be sure to rate it below! It is You have to give this amazing burger a try and please let me know what you think

    Print Recipe Pin Recipe
    4.86 from 7 votes

    Portobello Mushroom Sandwich

    This Portobello Mushroom Sandwich is the BEST! Big, rich and meaty this vegetarian burger will make you a believer of a meatless meal! It can be made in the slow cooker or Instant Pot and it's super easy.
    Prevent your screen from going dark
    Prep Time15 mins
    Cook Time4 hrs
    Total Time4 hrs 15 mins
    Course: Vegetarian
    Cuisine: American
    Servings: 2 sandwiches
    Calories: 712kcal
    Author: Deb Clark
    As an Amazon Associate I earn from qualifying purchases.

    Ingredients

    • 2 portobello mushrooms
    • 1 16 oz package pre-sliced mushroom
    • 1 red bell pepper
    • ½ red onion
    • ½ cup bbq sauce - use your favorite
    • 1 teaspoon salt
    • ½ teaspoon pepper
    • healthy pinch red pepper flakes
    • Coleslaw
    • ½ head cabbage
    • 2 carrots
    • ½ red onion
    • ½ cup mayonnaise
    • 2 tablespoons cider vinegar
    • 2 tablespoons honey
    • salt and pepper to taste

    Instructions

    • Clean the portobello mushrooms, remove the stem & fins, place in the slow cooker. Top with the pre-sliced mushrooms.
    • Slice the bell pepper, remove the seeds and slice into strips. Remove the outer peel from the onion and slice into strips. Place into the slow cooker with the mushrooms.
    • Season the vegetables with salt, pepper & red pepper flakes, top with bbq sauce. Put the lid on the slow cooker & cook on high for 4 hours or low for 6.
    • While the meal is cooking, make the cole slow. Thinly slice the cabbage, clean & shred the carrots (I use a box grater.), thinly slice the onions, place in a large bowl.
    • Mix the coleslaw dressing together - it will be quite thick, but that's how you want it. Mix the dressing with the vegetables, refrigerate until ready to use.
    • Toast the burger buns.
    • Assemble and enjoy!

    Nutrition

    Calories: 712kcal | Carbohydrates: 78g | Protein: 7g | Fat: 43g | Saturated Fat: 6g | Cholesterol: 23mg | Sodium: 2349mg | Potassium: 1258mg | Fiber: 11g | Sugar: 59g | Vitamin A: 12475IU | Vitamin C: 167.1mg | Calcium: 147mg | Iron: 2.3mg
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    Ok...maybe just ONE more picture of Juna with her proud Grandpa!

    Ok...maybe just ONE more picture of Juna with her proud Grandpa! 😀

    A burger bun topped with lettuce, portobello mushroom and bbq sauce. In the middle Portobello Mushroom Sandwich. The picture on the bottom is the portobello sandwich being topped with a dollop of coleslaw.

    Portobello Mushroom Sandwich is a big meaty (vegetarian) bite!

    Mushroom Burger Pin

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    About Bowl Me Over

    Welcome to Bowl Me Over! My name is Debra and I send warm greetings from sunny California. I am a serious foodie – I’ve been known as the go-to girl in our family for years, catering weddings and anniversary parties. In the summer I help cook mountains of food for our family reunions. Often times things I create end up in a bowl, hence the name Bowl Me Over! Let's stay connected, you can email me at [email protected] and find me on Facebook, Pinterest, Instagram, Twitter and YouTube.

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