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!
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Why you'll love this recipe
✔️ Great vegetarian meal, you won't miss the meat!
✔️ Loaded with flavor, it's easy to make and delicious.
✔️ 10 minutes of prep time!
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
Ingredients
For the exact measurements, please refer to the printable recipe card at the bottom of this post.
- portobello Mushrooms
- sliced Mushrooms
- red onion
- red bell pepper
- bbq sauce
- fixings for coleslaw (or pre-made from the Deli department)
Instructions
This is an overview of the instructions. For the complete directions just scroll down to the bottom!
- 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.
- Assemble the portobello mushroom sandwich, topping each with homemade slaw.
FAQ's
You can eat the gills, but they can be tough and not very palatable. Scrape them out and discard.
Similar to the gills, the stem can be tough. Remove it and discard.
Mushroom are very low carb and have a little protein.
Tips
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!
Use homemade bbq sauce or store bought sauce, either works!
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!
Portobello mushrooms give the sandwich that big steak flavor and making it in your slow cooker is super easy. A Portobello Mushroom Sandwich is big, meaty, hearty and most of all delicious!
Things to know
- 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
Related recipes
There are several great sandwiches on the blog - here are some of the favorites!
- Peanut Butter Honey Sandwich - a classic family favorite!
- Tomato Sandwich with Avocado and Pesto - perfect in the summertime when you're looking for a light meal.
- Avocado Toast Breakfast Sandwich - this is so good and a great way to start the day.
Read about more of our adventures here - Family Fun Night with the Oakland A's and our visit to Mesa Verde National Park
Serve with
- Salad and sandwich is always delicious - serve with Mom's Deviled Egg Potato Salad Recipe or a great Green Salad with Fruit.
- Top your sandwich with some yummy Tomato Relish!
- This recipe for Mexican fruit salad is another great pairing.
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If you love this recipe please leave a ⭐⭐⭐⭐⭐ rating!
Portobello Mushroom Sandwich
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
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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
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Don't worry, we'll never share your email.Recipe backstory
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!
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.
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!
Lois
This looks like a very enjoyable sandwich that I will be enjoying this coming week. Love everything in them.
Bowl Me Over
You would completely love this Mom. You're as big a fan of mushrooms as I am! 😀
Mary Decker
This looks very delicious! Can you tell me, Please, how you would adjust the recipe to see an Instant Pot? Thank you!
Bowl Me Over
Hey Mary - I've never used the pressure cooker for this recipe, however if I did, this is what I'd do - I'd sauté the peppers onions and sliced mushrooms in a tablespoon of oil first. Seasoning with salt, pepper and red pepper flakes. Then add the portobello mushrooms. Pour in half cup water. Increase the bbq sauce to one cup. Add the lid, seal. and set on manual. Set timer for four minutes and natural pressure release at the end. My only concern is the amount of liquid, so with that adjustment you should be set. Plus while it's cooking you can make the slaw. Enjoy! This is a delicious meal!!
Sandi
I love that you made something delicious based on your family's vacation memory. The baby is just precious...and that burger, OMG yummy!
Bowl Me Over
Thank you so much Sandi! Truly that's one of my favorite restaurants, we always dine there when we visit the Islands. And baby Juna... she has my heart! <3
Angela Campos
These sound amazing! I LOVE anything I can make in the crockpot, Pinned 🙂
Bowl Me Over
With all humbleness....it's a terrific burger! 😀 I hope you give it a try!
Manju | Cooking Curries
Such an adorable little baby girl!! The burgers look delicious. Bet you had a fabulous time over there!
Bowl Me Over
Yes, yes and yes! 😀 Thanks Manju, I appreciate you stopping by!
Ilka
Debra - thanks for introducing us to your beautiful granddaughter Juna! I can see what a proud grandparents you are !
The beach looks absolutely stunning and your recipe is fab as usual. Thanks for sharing this happy post with us. Pinning and stumbling! Congratulations!
Bowl Me Over
Thank you so much Ilka and thanks for stopping by for sharing!
Janet Vinyard
Hi Debra, Congratulations on your beautiful granddaughter! Thanks for sharing the recipe for Mushroom Burgers - I'm always looking for some meatless meals and this sounds great! Blessings, Janet
Bowl Me Over
Thanks Janet! She is quite the little cutie 😀 but of course I am a bit biased, LOL! Enjoy that burger!
linda spiker
Fabulous burger! Adorable baby!
Bowl Me Over
Thank you Linda!
Nettie Moore
Your slow cooker mushroom burger looks amazing!! Nettie
Bowl Me Over
Thank you Nettie!!!
Michaela Kenkel
First off -- CONGRATULATIONS on your sweet little one! You make being a grandma look so much fun! Beautiful pictures of her and of that incredible mushroom burger! SWOON! Makes me want to load up in the car and go grab the ingredients right now!
Bowl Me Over
She is such a sweetie, thank Michaela!! And that burger...go...run now and grab those ingredients! 😀
christine
Wow,, what a different burger. Love the flavors and super love that it's a slow cooker recipe. I want to pay more attention to it, but I just can't keep my eyes off that cutie pie baby! Oh what a love! And how stinkin cute is that little Hawaiian outfit? Seriously can't handle the cuteness!
Bowl Me Over
Hahaha, love that little hula skirt, LOL!!! She is our little sweetie pie! The burger is kinda of a side note huh? 😀
Patty Haxton Anderson
Seeing your kids and your grandchild - wow what a nice visit. See your hubby is your #1 supporter too! That burger, I would have never guessed it was done in a slow cooker. Holy cow it looks scrumptious. And, it's fun re-creating your restaurant favorites at home. Looks like you did it really well!
Bowl Me Over
Thank you Patty it was a super great visit. The kids are so lucky to live in Hawaii, and we are lucky to be able to visit! 😀
Kelli
I love your pictures and i just bet Mom & Dad did also!!!!
This burger looks fab, but alas i am gluten free so no bun....
How about some Gluten-Free recipes????? Pretty Pls..
thanks for all you do!! and for all you share!!
God Bless
Bowl Me Over
Yes they did Kelli & thank you very much! Proud G&G here!!! 😀 Stay tune for GF - yours is not the first request I've received lately, thank you so much for letting me know what you're interested in! Thank you Kelli, be in touch again soon! 😀
Healing Tomato
Baby Juna is the most adorable baby! Hawaii is a such a beautiful place, isn't it? Nothing tastes quite as good as a mushroom burger. They make for a great base for a patty. The coleslaw adds a nice crunch. I have to make this recipe over the weekend.
Bowl Me Over
Thank you Rini - she is the sweetest baby!!! Enjoy that burger, it's our very favorite!