Caramelized Onion Potato Gratin

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Give me all the gratins please!! This Cheesy Potato Gratin is one for the record books and you need it STAT.

Cheesy Potato Gratin from www.whatsgabycooking.com (@Whatsgabycookin)


 

I mean, what's not to love about thinly sliced potatoes layered with caramelized onions, heavy cream, tons of cheese, herbs, salt and pepper? It's basically the most magical side dish on the planet. And I am NOT to be left alone with it.  Somehow this Cheesy Potato Gratin always disappears very quickly and I don't want to be held accountable.

This will be making an appearance on my holiday dinner party table this year and I am 100% confident in saying you should be doing the same. TRUST. It's the best. Potato Gratin for EVERYONE.

Cheesy Potato Gratin from www.whatsgabycooking.com (@Whatsgabycookin)

If you tried this recipe, please leave a 🌟 star rating and let me know how it goes in the 📝 comments below. Thanks for visiting today

Cheesy Potato Gratin from www.whatsgabycooking.com (@Whatsgabycookin)

Cheesy Potato Gratin

Author: Gaby Dalkin
5 from 22 votes
Give me all the gratins please!! This Cheesy Potato Gratin is one for the record books and you need it STAT.
Prep Time 10 minutes
Cook Time 1 hour 10 minutes
Total Time 1 hour 20 minutes
Course Side Dish
Cuisine French
Servings 8 people

Ingredients
  

  • 2 pounds Yukon Gold potatoes (Russet potatoes also work as do sweet potatoes or a combination of any of the above)
  • Kosher salt and freshly ground pepper
  • 1 tablespoons olive oil
  • 1 yellow onion diced
  • 1 ½ cups heavy cream
  • 1 cup shredded Gruyère cheese
  • ¾ cup shredded parmesan cheese
  • ¼ cup crème fraîche or mascarpone cheese
  • Fresh thyme for garnish

Instructions
 

  • Preheat an oven to 400°F. Grease a 9-inch baking dish with butter or non-stick cooking spray.
  • Cut the potatoes into â…› inch slices. Arrange the slices, slightly overlapping, on the bottom of the baking dish and season with salt and pepper.
  • In a medium skillet, heat the olive oil over medium high heat. Add the onion and sauté until starting to caramelize, about 8-10 minutes. Add the heavy cream and bring the liquid to a simmer. Simmer until slightly thickened, about 5 minutes. Stir in ¾ cup of the gruyere cheese and all of the parmesan and cook until smooth and melted. Remove the mixture from the heat, let cool slightly and stir in the crème fraîche. Season with salt and pepper.
  • Pour the cream mixture evenly on top of the potatoes and sprinkle the remaining ¼ cup of Gruyere cheese evenly on top. Bake until golden brown and bubbly and the potatoes are fork tender when pierced with a knife, about 45 minutes to 1 hour. Let the gratin rest for about 15-30 minutes before serving. Garnish with thyme and serve.

Notes

I recommend learning to use a mandolin. With the safety features and patience you can easily cut even slices without getting your fingers.

Nutrition Information

Calories: 379kcal | Carbohydrates: 23g | Protein: 12g | Fat: 27g | Saturated Fat: 16g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 8g | Cholesterol: 79mg | Sodium: 290mg | Potassium: 571mg | Fiber: 3g | Sugar: 3g | Vitamin A: 933IU | Vitamin C: 24mg | Calcium: 331mg | Iron: 1mg
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106 Comments

  1. 5 stars
    I just made these to take to a friends home for dinner, along with Prime Rib. These potatoes were the star of the meal. As good as or better than the high end steakhouses. Is it the Gruyere, caramelizing the onion or the combo of cream and cheeses? Whatever it is, these are the bomb.com. The only change I made was used mascarpone instead of crime fraiche as per the suggestions. It was not difficult And I will make them again for sure. They also traveled well. An hour in the car and no need to reheat.

  2. Hi Gaby!
    This recipe sounds and looks delicious! I plan to make it on Christmas Eve for family. This serves 8-10, right? We're only serving 4 people. Would this recipe still turn out great if it was split to serve 4?

    Thanks!!!

  3. 5 stars
    Can’t wait to make this recipe for Christmas!! Also really hoping I win the set of all clad pots. Extra credit for commenting here, right? Haha Happy holidays!!

  4. Hi Gaby,

    If you were making this ahead and par-baking it, how long would you bake for? I was going to make it the night before... Thanks!

    Nicole

  5. I made these for Christmas on a whim. The family literally took spoons after the meal was done and finished it off. They were so darn good, and we're making again in a few weeks for easter. Ya'll this WILL NOT disappoint ! Spoil your family and loved ones with this recipe!!

  6. Can’t wait to try this!! I am making it for our neighborhood monthly cookbook share. This month we are featuring all recipes from your cookbook!! Love everything I see and am flipping between this and the Chicken Chili Verde!! Which one should I make and bring!!

  7. We made this with beef tenderloin on Christmas Day. It was a huge hit and will now be our go to potato gratin recipe! Super easy and absolutely delicious!!

  8. HOLY GOODNESS was this so darn good! The family polished every bit of this away. I did sub emmanthal for the gruyere. This will be a staple dish for now and forever!

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