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Home » Dinner » Portobello Scalloped Potatoes Au Gratin

Portobello Scalloped Potatoes Au Gratin

Created: February 27, 2015 Updated: April 12, 2023 by Lyuba Brooke 6 Comments *This post may contain affiliate links. Read More...

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Unbelievably delicious creamy and cheesy scalloped potatoes dish. Thinly sliced potatoes, layered with sliced portobello mushrooms and cheese, all baked in a creamy sauce.

Scalloped Potatoes Au Gratin with mushrooms in a glass pan

Scalloped Potatoes

Who loves scalloped potatoes??

Well, they just…got…better!

Can you say cheesy? Can you say creamy? Let me hear you say, “I love mushrooms and potatoes!”

Alright, no more cheer leading. This is a fabulous dish and I hope it convinces you to make it and try it.

Portobello Scalloped Potatoes Au Gratin being lifted out with a metal spoon

I did also have to settle the question that I’ve had in my head for years! What is the difference between scalloped potatoes and “potatoes au gratin?”

After reading many articles, forums, and comments, I realized that people mostly use the two terms interchangeably. As did I for a long time. But, what I found out is that scalloped potatoes are made with thinly sliced potatoes and creamy sauce.

“Potatoes au gratin” means that it was baked with cheese and sometimes cheese and breadcrumbs topping. Au gratin can also be made with other vegetables in addition to potatoes or just other vegetables with no potatoes.

That is perhaps why you would see some recipes for potatoes named as “scalloped” and “au gratin.” Because they are thinly slices and baked with cream and cheese. So I guess these are Scalloped Potatoes Au Gratin!

Scalloped Potatoes Au Gratin with green onions on top in a glass baking dish

Glass baking dish with scallopred potatoes portobello au gratin on a wooden cutting board with a silver spoon and whiteish tan cloth in the background

Scalloped Potatoes and Portobello Au Gratin

Thinly sliced potatoes, layered with sliced portobello mushrooms and cheese, all baked in creamy sauce.
5 from 1 vote
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Course: Side Dish
Cuisine: American
Prep Time: 10 minutes minutes
Cook Time: 1 hour hour 10 minutes minutes
Total Time: 1 hour hour 20 minutes minutes
Servings: 6
Calories: 482kcal
Author: Lyuba Brooke

Ingredients

  • 2.5 lbs russet potatoes washed and peeled
  • 0.5 lb portobello mushrooms large
  • 1 1/2 cups shredded Mozzarella cheese
  • 6 oz sharp white cheddar cheese grated
  • Pint heavy whipping cream
  • 1/2 cup sour cream
  • 1/3 cup mayonnaise
  • 3 garlic cloves
  • 1 tsp thyme
  • Salt fresh cracked pepper

Instructions

  • Preheat oven to 350 and grease a 13×9 baking pan.
  • In a mixing bowl, whisk together sour cream, mayo, heavy cream, pressed (or grated) garlic, salt and pepper.
  • If you have a mandolin slicer, slice potatoes. (If you don't have one just slice them thin with a knife.) Slice mushrooms thin as well.
  • Spread some of the cream sauce on the bottom of the baking dish and start layering half of the potatoes. Don't stack the potatoes but rather overlap if you have to.
  • Spread half of mushrooms over potatoes, evenly. Spread half Mozzarella cheese and half of white cheddar cheese. Add some salt, pepper and thyme.
  • Repeat the second layer: remaining potatoes, remaining mushrooms, remaining cheese.
  • Pour cream sauce over the top, as evenly as possible.
  • Bake for 60-70 minutes until all potatoes are done. You can stick a knife slowly in the middle and feel how easily it goes through the potatoes.

Nutrition

Calories: 482kcal | Carbohydrates: 38g | Protein: 18g | Fat: 29g | Saturated Fat: 13g | Polyunsaturated Fat: 6g | Monounsaturated Fat: 7g | Trans Fat: 0.03g | Cholesterol: 67mg | Sodium: 459mg | Potassium: 1003mg | Fiber: 3g | Sugar: 3g | Vitamin A: 619IU | Vitamin C: 12mg | Calcium: 392mg | Iron: 2mg
Tried this recipe?Mention @willcookforsmiles and tag #willcookforsmiles

Scalloped Potatoes being lifted out of a pan with a spoon

Scalloped Potatoes Au Gratin in a glass baking

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Portobello Scalloped Potatoes Au Gratin in a glass pan

More Recipes From Me:

Chipotle Cilantro Lime Roasted Potatoes

Parmesan Dill Potato Salad

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LYUBA

ABOUT LYUBA

I’m Lyuba Brooke, mother of 2, the cook, recipe developer, photographer, and author behind willcookforsmiles.com. I share many classic and original recipes, cooking tips, and tutorials. My passion is sharing delicious meals for everyone to try. Read more...

2.8K shares

Filed Under: Dinner, Potatoes, Side Dishes, Vegetarian

All images and text ©Lyubov Brooke for ©Will Cook For Smiles. Please do not use my images without prior permission. If using my posts in collections and features, please link back to this post for the recipe. Disclaimer: Nutrition information shown is not guaranteed to be 100% accurate as most ingredients and brands have variations.

Comments

  1. sylvie says

    March 8, 2015 at 1:54 pm

    Beloved potatoes, I love potatoes in every way imaginable. This comfort dish will be soon in my kitchen, per sure! You look so young but though so experimented and great cooker, congratulations!

    Reply
    • lyuba says

      March 10, 2015 at 9:31 pm

      I hope you will enjoy it, Sylvie! Thank you so much 🙂

      Reply
  2. Marisa Franca @ All Our Way says

    February 27, 2015 at 3:47 pm

    Um, um, um!! How can you possibly go wrong. I will stand up and cheer for scalloped potatoes or potatoes au gratin. I’ve made both but I’ve got to admit I haven’t added the mushrooms. That would be a great taste change — sort it up it another notch. Wonderful recipe and fantastic photos!!

    Reply
    • lyuba says

      March 10, 2015 at 9:32 pm

      So good with the mushrooms!
      Thank you so much, Marisa!!

      Reply
  3. Linda Z says

    February 27, 2015 at 10:21 am

    This sounds delicious, but i don’t really like portobella mushrooms, so im thinking im going to use eggplant.

    Reply
    • lyuba says

      March 10, 2015 at 9:34 pm

      That would be very interesting, Linda! Let me know how you like it with eggplant 🙂
      Thank you so much!

      Reply

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Well, hey there!

I’m Lyuba Brooke, mother of 2, the cook, recipe developer, photographer, and author behind willcookforsmiles.com. I share many classic and original recipes, cooking tips, and tutorials. My passion is sharing delicious meals for everyone to try. Read More.

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