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.
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!
We made a trip over to Hawaii to see the kids. As always, a trip to the Islands is such a treat and this time it was even sweeter because we went to see our Grandchild Baby Juna!
Juna & I - here she's about 10 weeks old!
Juna was just 10 weeks old and a sweet bundle of joy! I got to hold her and cuddle her....such a sweetie pie!
Ingrid watches carefully over Juna while I babysit!
Above is my favorite picture I took, it hangs above my desk in my office. Our Granddog Ingrid was very concerned when Mommy left and had to make sure I did everything just right! It was a precious moment. 
And there were a few more fun ones.... I mean Juna was born in Hawaii so she obviously needs a hula skirt...right? My friend Gina made this for her and it turned out super cute!!! Dan and I decided Juna should call us Grandma & Grandpa Tutu. (Tutu is Hawaiian for Grandma/Grandpa.) Ok....am I being the doting Grandmother? 😀 Needless to say, Juna has our hearts!
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
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!
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!
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 -
- 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.
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! 
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!
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
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
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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Ok...maybe just ONE more picture of Juna with her proud Grandpa! 😀
Portobello Mushroom Sandwich is a big meaty (vegetarian) bite!
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! 😀
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!