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You’ll never look at a mushroom the same way again after you sample these Portabello Fries dipped in a classic mustard-flavored béchamel sauce!

A plate of food on a table, with Portabello Fries with Belchamel Mustard Dipping Sauce

This week I’ve experienced a big (actually, HUGE) dose of reality upon returning to work after our mini-vacation to the Isle of Palms and Charleston, South Carolina. It’s been especially hectic at work (I need another vacation!), but that hasn’t kept me from daydreaming about the sand and surf and all the delicious food we enjoyed during those few short days. *Sigh*

For me, a few days at the beach is so therapeutic. There’s just something about watching and listening to the waves crash against the shore that is calming. *Sigh, again!* Needless to say, it was a lovely vacation.

A group of people walking in front of a brick building

We hopped over to Charleston for a little sightseeing and dinner on two of our days. I love all the history and architecture of this charming Southern city with its cobblestone streets and beautiful brick and iron details on the stately homes! By accident, we wandered into High Cotton for a cool drink and appetizers to escape the heat of the day. What a find! True Southern hospitality. A waiter wearing a bowtie. And…Portabello Mushroom Fries with béchamel dipping sauce!

A close up of food, with Fried Portabello Mushroom Fries and Béchamel Mustard sauce

I decided that I had to try to make these at home, but with my own twist on the béchamel — flavored with stone ground mustard and Parmesan cheese. They were delicious! Two large portabello mushrooms made a nice appetizer tray that would easily serve four people. The “fries” are breaded using the three-step method — dredge in flour, dip in beaten egg wash, then dredge in a panko bread crumb mixture — and then deep fried until golden.

A series of doorways in Charleston, SC

We’ve already decided that a long-weekend in Charleston with cooler weather would be perfect for exploring…and eating! There are so many wonderful restaurants to try. On this trip, the crab cakes with corn relish, roasted red pepper sauce, and crispy onion straws at Fleet Landing were outstanding, by the way!

A bowl of food on a plate, with Portabello Mushrooms and Béchamel Mustard sauce

And, these mushrooms…they were definitely memorable. I’ll be making these again very soon, and you should, too!

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A plate of food on a table, with Portabello Fries with Belchamel Mustard Dipping Sauce

Portabello Fries with Béchamel Mustard Dipping Sauce

You’ll never look at a mushroom the same way again after you sample these Portabello Fries dipped in a classic mustard-flavored béchamel sauce!
3.67 from 3 votes
Prep Time 15 mins
Cook Time 10 mins
Total Time 25 mins
Course Appetizers
Cuisine American
Servings 4 servings
Calories 302 kcal



  • 1 tablespoons butter
  • 1 tablespoons all-purpose flour
  • 1/2 cup milk
  • 1/2 cup shredded Parmesan cheese
  • 1 teaspoon stone ground mustard
  • Salt and pepper to taste

Mushroom fries:

  • Canola oil for frying
  • 2 large portobello mushrooms
  • 1/3 cup all-purpose flour
  • 3/4 cup panko bread crumbs
  • 3 tablespoons finely grated Parmigiano-Reggiano
  • 1 tablespoon chopped fresh parsley leaves
  • Salt and freshly ground black pepper
  • 2 large eggs lightly beaten



  • Melt butter over medium heat and stir in flour. Cook 2-3 minutes and gradually add in the milk. Reduce heat and whisk until smooth and mixture is slightly thick.
  • Add cheese and stone ground mustard and stir until melted. Season with salt and pepper to taste.

Portabello fries

  • Preheat oil in a deep-fryer to 350 degrees.
  • Prepare the mushrooms by removing the gills and stems from the underside. Trim the edges off and slice into 1/4-inch strips.
  • Prepare dipping station in three shallow dishes. Add flour to the first dish, the beaten eggs to the second dish, and in the last dish combine panko, Parmigiano, parsley, salt and pepper.
  • Dredge the mushrooms in flour, followed by the egg wash and finally in the panko.
  • Cook a few mushroom fries at a time for 3 to 4 minutes, or until golden brown. Drain on a paper towels and then serve with the dipping sauce.


Recipe adapted from The Neelys


Serving: 1ServingsCalories: 302kcalCarbohydrates: 28gProtein: 14gFat: 15gSaturated Fat: 6gPolyunsaturated Fat: 8gCholesterol: 114mgSodium: 620mgFiber: 2gSugar: 2g
Keyword bechamel, dipping sauce, portabello mushrooms
Tried this recipe?Let us know how it was.
A bowl of food on a plate, with Bechamel Mustard Dipping sauce


  1. I absolutely love Charleston! What a great spot for you to get away to! Now…these portabello fries! OH MY! They look so amazing! The dip ain’t bad, either 🙂

  2. Charleston, SC has been on my travel bucket list for a while now. 🙂 And what a great recipe! I would take portabello fries over regular fries any day of the week. Yum!

  3. I would need quadruple the batch of these they looks so good. I love portobello mushrooms so this is right up my alley!

  4. What a great recipe idea! These fries look fantastic and I know my family would love snacking on them.

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