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Grilled Mushroom Cheesesteaks

Grilled Mushroom Cheesesteaks

Grilled mushrooms and grilled onions with a light cheese sauce makes for the ultimate vegetarian cheesesteak.

Update and Disclosure: Back in 2015, l participated in a farm tour sponsored by The Mushroom Council but I was not compensated to write this post. Opinions and thoughts are my own but I think I formed my love for mushrooms in the womb. And this recipe is now the second most popular recipe on our blog (here’s hthe most popular.)

I have professed my love for mushrooms here many times.

Like with these Grilled Veggie Portabella Mushroom Pizzas and these Loaded Veggie Nachos. Or Gnocchi with Spring Greens and Crimini Mushrooms.

And even though I’ve lived a mere 25 miles away from The Mushroom Capitol of the World: Kennet Square, PA (due west from Philadelphia) for most of my life, I’ve never visited a mushroom farm.

But let’s get to the recipe first (scroll down to learn more about mushroom farming and my Mushroom Council Tour):

Today, we’re talking cheesesteaks (since I’m a Philly girl after all.)

#vegetarian Grilled Mushroom Cheesesteaks from a Philly gal @tspbasil #sponsoredtravel Click To Tweet

If you’re a local, you order like so: “One whiz with” which translates to “one cheesesteak with Cheez Whiz and with grilled onions.” (Typically, your only other cheese choice is provolone.)

Confession: So, I’m actually not a huge cheesesteak fan. Sometimes I go for a chicken cheesesteak or a vegetarian cheesesteak – which is practically blasphemous among cheesesteak purists.

But why not combine one Pennsylvania food treasure into another and this grilled mushroom cheesesteak also fits right into #MeatlessMonday.

My rendition of Cheez Whiz is made with just flour, a pat of butter and some really good cheddar. And if you are mushroom lover like me, I don’t think you’re going to miss the steak with this baby.

[Affliated Link] –> my favorite grill pan that I use for these cheesesteaks and anytime we’re not using the outdoor grill—>Calphalon Contemporary Nonstick 11-Inch SquareGrill Pan.

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Grilled mushrooms and grilled onions with a light cheese sauce makes for the ultimate veggie cheesesteak. Recipe at

Grilled Mushroom Cheesesteaks

5 from 1 review

  • Author: Deanna Segrave-Daly
  • Yield: 4 servings. 1x


Grilled mushrooms and grilled onions with a light cheese sauce makes for the ultimate veggie cheesesteak.



For the mushrooms:

  • 1 tablespoon olive oil
  • 1 medium onion, sliced thinly
  • 20 ounces baby bella or white button mushrooms, sliced
  • 1 tablespoon reduced sodium soy sauce
  • 1/4 teaspoon black pepper

For the “cheese whiz” sauce:

  • 1 tablespoon unsalted butter
  • 1 tablespoon all-purpose flour
  • 2/3 cup low-fat milk (warmed for 1 minute in microwave)
  • 4 ounces Cabot Extra Sharp Cheddar
  • 4 (6-inch) whole-wheat rolls


  1. In a grill pan, heat olive oil over medium heat. Add onion and cook for about 5 minutes, stirring occasionally.
  2. Add mushrooms and grill for about 10 minutes, stirring occasionally.
  3. Add soy sauce and black pepper, stir and grill for another 5 minutes, stirring occasionally. Remove from pan.
  4. Place rolls, cut side down on pan and grill for a few minutes until toasted.
  5. While mushrooms are grilling, make cheese sauce by placing a small sauce pan over medium heat. Add butter and once melted, whisk in flour.
  6. Slowly pour in warm milk, whisking constantly. Whisk frequently until sauce thickens (about 2 – 3 minutes.)
  7. Slowly whisk in cheese and whisk until melted. Remove from stove.
  8. To assemble sandwiches, divide mushrooms evenly among 4 rolls. Pour cheese sauce over mushrooms and serve immediately.

Grilled Mushroom Cheesesteaks |

And onto the Mushroom Tour….

Back in June 2015, The Mushroom Council hosted eight of us registered dietitians – half of us bloggers and the other half supermarket RDs for the day learning about the latest in nutrition research, hearing about The Blend promotion and touring two mushroom farms (and of course, eating lots of local mushrooms.)


Freshly picked mushroom from To-Jo Farms @tspbasil

The freshest mushroom I’ve ever eaten (at To-Jo Farms.)

Some interesting facts and cool tidbits I picked up during the day:

Mushroom Farming

  • 65% of the world’s mushrooms are grown in this region of Pennsylvania
  • Mushroom farmers are the ultimate recyclers – a typical compost used is a mix of straw, hay, horse manure, cocoa shells (from Hershey’s chocolate) and corn cobs.
Tony and Joe D'Amico - 4th generation owners of To-Jo Mushrooms via @tspbasil

Tony and Joe D’Amico – 4th generation farmers at To-Jo Mushrooms

Touring To-Jo Mushroom Farm |

Behind the mountain of compost for mushroom growing.

  • The most popular mushrooms, white button, take 11 weeks to grow.
  • Exotic mushrooms grow the range from oyster mushrooms (about 18 days) to shiitakes (up to 5 months.
Yellow oyster mushrooms grown at Phillip Mushroom Farm @tspbasil

Exotic yellow oyster mushrooms grown at Phillip Mushroom Farm.

Royal trumpet mushrooms grown at Phillip Mushroom Farm @tspbasil

Royal trumpet mushrooms grown at Phillip Mushroom Farm.

One of our swag gifts was an oyster mushroom growing kit from Back To The Roots. And this black thumb gardener grew mushrooms in less than 2 weeks on the kitchen counter – so cool!

Grow mushrooms in 10 days with this mini farm from Back To The Roots @tspbasil

Emerging Mushroom Nutrition Research

Mushroom Cooking Tips

  • The Blend: Swap in diced mushrooms for about 30% of ground meat to make healthier burgers, tacos, meatballs, meatloaf (the list goes on.) The benefits:
    • Less calories and fat
    • Reduced sodium by 25%
    • Increased Vitamin D
    • Enhanced flavor
  • Use diced white button mushrooms when mixing with ground chicken/turkey/pork
  • Use diced portabellos when mixing with ground beef 
  • For some burger inspiration, check out the James Beard Foundation’s Better Burger Project and see if there’s a restaurant near you with a customized mushroom blended burger on the menu.
The Woodlands at Phillips mushroom store via @tspbasil

The Woodlands at Phillips – A fabulous store that sells all things mushrooms and host cooking classes in Kennett Square, PA.

Ever had a Philly cheeesteak? What’s your favorite way to cook or eat mushrooms?

Grilled mushrooms and grilled onions with a light cheese sauce makes for the ultimate veggie cheesesteak. Recipe at

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Tuesday 16th of February 2021

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Tuesday 4th of September 2018

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Wednesday 9th of May 2018

I just made this for my boyfriend and myself. He gobbled his up. I am so happy. I literally felt like you held my hand every step of the way. It genuinely turned out fantastic. I will make this again. Thank you. It was so handy to come home from work and make something quick and incredibly tasty. It was just great to come home and make this with ingredients one would mostly have to hand

Deanna Segrave-Daly

Wednesday 9th of May 2018

I'm so glad to hear this - thank you for taking the time to share and now I have to make these again as it's been too long :)


Sunday 8th of October 2017

I’m making these tomorrow for dinner! Can’t wait to eat them!

Deanna Segrave-Daly

Sunday 8th of October 2017

Yay! Definitely LMK how they turn out!

Jill VanDerBerg

Sunday 25th of June 2017

Will be making these tomorrow with addition of finely shaved beef (I'm a committed carnivore) and swapping Swiss cheese in the whiz. Really appreciated the mushroom tour info!

Deanna Segrave-Daly

Monday 26th of June 2017

Sounds delish - thanks for stopping by!

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