Root Vegetable Gratin Recipe | Vintage Mixer (2025)

Gratin made with potatoes and root vegetables are a new must as far as Thanksgiving side dish recipes go. This potato au gratin with gruyere is super cheesy yet also gluten free made with Bob’s Red Mill gluten free flour.

Victoria a local chef in Salt Lake City is a genius when it comes to healthy, seasonal recipes. She originally gave me the idea for this delicious root vegetable gratin recipe years ago at a small gathering we created together around holiday dishes. All of her recipes from that evening were amazingly delicious, using seasonal vegetables, and healthy substitutes, but this one was a favorite.

Root Vegetable Gratin Recipe | Vintage Mixer (1)

Since then, I’ve been altering this recipe every year, adding this or that, trying out different cheeses, and now also trying with with a gluten free flour. This updated recipe is my favorite thus far. The gruyere cheese really puts it over the top.

Root Vegetable Gratin Recipe | Vintage Mixer (2)

Root Vegetable Gratin Recipe | Vintage Mixer (3)

Au Gratin with Gruyere from Scratch

When making au gratin from scratch you need a few simple ingredients, root vegetables of any type, cheese and seasonings. The secret to making au gratin from scratch is using a food processor to thinly slice all of the potatoes and root veggies. This speeds up the process tremendously. Make sure and slice up the potatoes right before you’re ready to use them because if you do it too soon then they will start to discolor.

This root vegetable gratin recipe is actually quite simple and the beauty of it is, you can use whatever root vegetables you have on hand.

Root Vegetable Gratin Recipe | Vintage Mixer (4)

Substitutions for potatoes in gratin

Instead of the traditional, all potato gratin, this recipe has a blend of several root vegetables. If you don’t have celery root or maybe your just a little uncomfortable with the large gnarly brown root, try the pretty purple and white root vegetable- rutabaga or the slightly bitter turnip. Rutabagas are slightly more sweet, while celery root taste similar to celery but more mellow, and turnips have a flavor similar to horseradish, which my husband loves.

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Making Gluten free Au Gratin

Most au gratin recipes are naturally gluten free. The recipe that I began with years ago has some flour in it to help soak up some of the half and half, and to cause the potatoes and veggie to stick together more. I have since altered it to use Bob’s Red Mill gluten free flour which works perfectly find and doesn’t add any extra flavor or texture.

This layered root vegetable gratin has been a crowd pleaser ever since first creating it years ago for our gathering and it has even gotten better over the years.

Root Vegetable Gratin Recipe | Vintage Mixer (6)

Root Vegetable Gratin Recipe | Vintage Mixer (7)

Root Vegetable Gratin Recipe | Vintage Mixer (8)

Becky Rosenthal

A healthier version of potato au gratin using root vegetables and gluten free flour.

Print Recipe Pin Recipe

Prep Time 25 minutes mins

Cook Time 1 hour hr

Total Time 1 hour hr 25 minutes mins

Course Side Dish

Cuisine American, Holiday

Servings 8 servings

Ingredients

  • 2 sweet potatoes, peeled and sliced 1/4” thick
  • 2 russet potatoes, peeled and sliced 1/4” thick
  • 1 rutabaga, celery root, or turnip peeled and sliced 1/4 “ thick
  • 1/3 cup gluten free flour*
  • 1/2 cup Parmesan cheese, shredded
  • 1 1/2 cups gruyere cheese, shredded
  • 2 cups half and half
  • 1 Thai chili, minced, or 2 teaspoons Red Chile flakes
  • 3 garlic cloves, minced
  • 1/2 cup scallions, chopped
  • 1 teaspoon fresh herbs like rosemary and thyme, chopped
  • 1 teaspoon salt
  • 1/4 teaspoon freshly ground pepper

Instructions

  • Preheat oven to 375.

  • Use a food processor to thinly slice up the potatoes and root vegetables.

  • In a small sauce pan combine the half and half, scallions, garlic, chilies and herbs. Bring to a simmer. Add salt and pepper. Set aside.

  • Layer sweet potatoes in a baking dish coated with pan spray. Sprinkle with 1 tablespoon of gluten free flour. Add a layer of cheese. Pour some of the half and half mixture over the potatoes. Add a layer of russet potatoes, flour and some more cream. Continue layering until all of the potatoes, root vegetables, flour and half and half have been used. Top vegetables with remaining grated cheese.

  • Cover pan with aluminum foil and bake in over for 50-60 minutes. Remove foil for the last 10 minutes of cooking. Remove from oven and serve.

Notes

The gluten free flour in this recipe helps the gratin set and stick together. Gluten free flour and all purpose flour may be used here interchangeably.

Keyword gluten free, potatoes au gratin

Posted in

Fall, Recipes, Seasonal, Side Dish, Vegetarian, Vintage Mixer

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Root Vegetable Gratin Recipe | Vintage Mixer (2025)

FAQs

Why should the potato slices for the gratin not be soaked in water before adding to the cream? ›

I don't recommend soaking the potatoes in water ahead of time for our potatoes au gratin (as some recipes call for). Soaking them will cause them to lose some of their starch, which helps to keep this dish creamy. The dish will still get a nice, crisp top without soaking the potatoes.

What makes something a gratin? ›

A gratin is a dish that is topped with cheese, or bread crumbs mixed with bits of butter, then heated in the oven or under the grill until brown and crisp. The terms au gratin or gratinée refer to any dish prepared in such a manner.

What does au gratin mean in the kitchen? ›

What Does “Au Gratin” Mean? A “gratin” is any dish that is topped with cheese or breadcrumbs mixed with butter, then heated in the oven or under the broiler until brown and crispy, according to The Food Lover's Companion. The term au gratin or gratinée just refers to anything prepared in that manner.

Why do you put vinegar in potato water? ›

Vinegar causes the potatoes to form a thin crust that further helps in retaining their shape. Vinegar increases the acid pH levels of water which further helps the potato just like when you add a little salt to the water while boiling eggs.

Why is my gratin too watery? ›

Why are my au gratin potatoes watery? There might be a few reasons for watery potatoes. Too Much Liquid: Using excessive cream and milk can result in a watery dish. Potato Type: High water content potatoes (like red or new) instead of starchy types (like Russet or Yukon Gold) can make the gratin watery.

What's the difference between scalloped potatoes and potato gratin? ›

The difference comes down to cheese. Scalloped potato recipes are usually baked in a basic cream sauce until soft and tender, with no cheese topping. Potatoes au gratin are a bit more decadent. They are made with lots of cheese sprinkled in between the layers of potatoes and also on top of the casserole.

What is the cooking technique used in gratin? ›

Derived from the French verb gratiner — to broil — gratin is a process that involves topping a dish with either cheese or buttery breadcrumbs and baking or broiling until crispy.

How deep should a gratin dish be? ›

Butter a gratin dish (which should be long and large and about 5 cm (2 in) deep) and sprinkle 2 chopped garlic slices on the bottom, a pinch of salt and pepper and more nutmeg.

Why do my au gratin potatoes curdle? ›

The curdling is caused by high heat, which is hard to avoid in an oven.

What does gratin mean in French? ›

The phrase au gratin literally means "by grating" in French, or "with a crust," from the verb gratter, "to scrape, scratch, or grate." Definitions of au gratin. adjective. cooked while covered with browned breadcrumbs (and sometimes cheese) synonyms: cooked.

Is gratin Italian or French? ›

This "gratin style potatoes" as North Americans call it has been a traditional French dish since the 18th century even though its origins date back to the 16th century and the appearance of the tuber in Europe.

What does soaking potato slices in water do? ›

Soaking potatoes in water helps remove excess starch. Excess starch can inhibit the potatoes from cooking evenly as well as creating a gummy or sticky texture on the outside of your potatoes. Cold water is used because hot water would react with the starch activating it, making it harder to separate from the potatoes.

What will happen to potato slices soaked in salt water? ›

– When the potato is put into the distilled water, it will absorb the water. The water is trying to dilute the salt inside the potato. – When the potato is put into salty water, it will lose water. The water in the potato moves towards the salty water to try to dilute it.

Should potatoes be soaked before baking? ›

Then cover the potatoes completely with cold water and let them soak for at least 30 minutes (or up to overnight). This will help to rinse off the excess starch and help the potatoes crisp up beautifully in the oven.

Why do we soak potatoes after you slice them? ›

"Placing [peeled and cut] potatoes in water helps prevent oxidation, which turns their exposed flesh brown," says Ronna Welsh, the author of The Nimble Cook and the owner and chef instructor at Purple Kale Kitchenworks in Brooklyn, N.Y. While oxidation won't make the potatoes unsafe to eat, it does change their flavor.

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