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Grilled Portabellas with Caramelized Onions and Avocados

Rated as 4.65 out of 5 Stars

"Big, meaty portabella mushrooms team nicely with cool and creamy avocado slices and rings of slow-cooked red onions. Cook the mushrooms on a grill, or broil them. You get lots of great flavor, but a lot fewer calories, than a regular burger."
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30 m servings 241
Original recipe yields 4 servings


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  1. Broil or grill mushrooms on both sides until just tender, about 5 minutes per side. Sprinkle with salt and pepper.
  2. Cook onions in olive oil over medium heat until very tender, stirring occasionally, about 10 to 12 minutes.
  3. Cut avocado in half, remove the pit, and peel and cut into slices.
  4. Toast buns. Top bun bottom with grilled portabella, 1/4 of the onion and avocado slices. Top with bun top.

Nutrition Facts

Per Serving: 241 calories; 12.6 28.1 5.4 0 501 Full nutrition


Read all reviews 12
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My plan was to have these with our grilled steaks tonight (without the bun) but Hubs was not amenable to that and, for that matter, really wasn't too enthused about trying it period. He did agr...

very good. i thought you carmalized onions with sugar. added a little splenda to onion. very good. DH said onion made the recipe- we didnt use the bun

Very tasty! I seasoned them lightly with Montreal Steak seasoning and added a slice of provolone! Great meatless meal!

I used my panini maker to grill the portobellos - easy and quick! I also added some crumbled gorgonzola cheese and sliced tomatoes to the sandwich. Tasty!

Hit the spot! Perfectly simple and tasty. I put a slice of baby swiss on top. Will make again.

Loved it! My Husband gave it 5 stars and that is hard to get! I did change it a bit as I did not have an avocado. Instead, I added some fresh picked rosemary and thyme to the mushrooms as the...

Very good. I thought it would need some more condiments but it was fine without it. Very weight watchers friendly.

Loved this recipe! My 12 year old said she now prefers this over a hamburger! We added mayo on the bun. She said she would like to add mozerella to hers next time. I like it as is.

So easy and delicous. Even my husband who is a devoted carnivore enjoyed. Served with sweet potato fries.