Appetizers and Sides/ Recipes

Potatoes Au Gratin

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Potatoes Au Gratin are a one of my favorite side dishes. I actually grew up eating the boxed version (GASP!) but it wasn’t until recently that I started making these myself and there’s just no comparison!

This recipe for Potatoes Au Gratin is a keeper for sure. The potatoes are so creamy on the inside and the top of the dish gets a crusty browned cheese that everyone will fight over!

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We, like most people, serve mashed potatoes every year for Thanksgiving. But I think this year I might serve these instead (or maybe both!). It’s always nice to try something new and these are definitely something that I know our family will love!

So here’s what you need to make these potatoes au gratin:

  • 3 pounds of red potatoes
  • 1 and 1/4 cup of grated Gruyère cheese
  • 1 and 1/4 cup of grated parmesan cheese
  • 1 small yellow onion
  • 2 cups heavy cream (sorry…milk won’t work for this one)
  • 2 teaspoons salt
  • 1 teaspoon of pepper
  • 1 teaspoon of garlic powder
  • 1 tablespoon of fresh thyme leaves

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Just from looking at the ingredient list, you can already tell that these are some really decadent potatoes! They are a special treat and they don’t skimp on flavor. I don’t make too many things with heavy cream but potatoes au gratin is just one of those things that needs to be nice and creamy. Trust me, it’s worth it!

potatoes au gratin, au gratin potatoes, scalloped potatoes, potatoes, side dish, easy side dish, potatoes au gratin recipe, coco and ash

The potatoes in this dish are sliced very thin. I used this Oxo mandolin slicer that comes in a set of graters and slicers. I love it because it has everything all in one neat box that doesn’t take up a lot of space. Also, I’m quite fond of keeping my fingertips and this slicer comes with a finger guard. If you don’t use a guard, PLEASE be careful. A mandolin slicer is one of the most dangerous kitchen tools. If you don’t have one or don’t feel comfortable using one, just use a knife and take your time.

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Once you’ve done your prep work, you can toss everything in together with the cheeses, cream, and seasonings. I like to use my hands to do this just so I can separate the potatoes as I toss them so they aren’t all stuck together.

potatoes au gratin, au gratin potatoes, scalloped potatoes, potatoes, side dish, easy side dish, potatoes au gratin recipe, coco and ash

After everything is combined, the potato mixture gets added to the greased baking dish and topped with more cheese! Cover it and bake it for 60 minutes, then uncover for 30 more minutes. The top should be a gorgeous golden brown!

potatoes au gratin, au gratin potatoes, scalloped potatoes, potatoes, side dish, easy side dish, potatoes au gratin recipe, coco and ash

Tips for making potatoes au gratin:

  • Be careful slicing the potatoes! Use either a mandolin slicer WITH a finger guard, or a sharp knife.
  • Use your hands to toss the potatoes in the cream so you can separate the potatoes that have stuck together.
  • Use butter to grease your pan for extra color around the edges.
  • Use THIS OXO slicer to grate your cheese, slice your potatoes, and even grate the onion!
  • If the top doesn’t brown as much as you’d like, set the oven to broil and watch carefully for just a few minutes.
5 from 6 votes
potatoes au gratin, au gratin potatoes, scalloped potatoes, potatoes, side dish, easy side dish, potatoes au gratin recipe, coco and ash
Potatoes Au Gratin
Prep Time
15 mins
Cook Time
1 hr 30 mins
Resting time
15 mins
Total Time
1 hr 45 mins
 
Course: Side Dish
Cuisine: American
Keyword: Au Gratin Potatoes, Potatoes Au Gratin, Scalloped potatoes
Author: Coco and Ash
Ingredients
  • 3 pounds red potatoes
  • 1 and 1/4 cup grated gruyere cheese
  • 1 and 1/4 cup grated parmesan cheese
  • 1 small yellow onion (about 1/3 cup diced)
  • 2 cups heavy cream
  • 2 teaspoons salt
  • 1 teaspoon black pepper
  • 1 teaspoon garlic powder
  • 1 tablespoon fresh thyme leaves
Instructions
  1. Pre-heat your oven to 400 degrees.

  2. Slice your potatoes as thin as you can. I use this mandolin slicer but you can use a knife and cut them to about 1/8 inch thick. 

  3. Mix your cheeses together and set aside 1/2 cup of cheese for the topping. 

  4. In a large bowl, whisk together the remaining 2 cups of cheese, onion, cream, salt, pepper, garlic powder and thyme.

  5. Add the potatoes to the mixture and toss to combine. The best tool for this is just your hands!

  6. Grease a 9x13 baking dish with either butter or cooking spray and add in the potato mixture. 

  7. Top the potatoes with the remaining 1/2 cup of cheese and cover the dish tightly with foil.

  8. Bake for 1 hour then uncover the potatoes and bake for another 30 minutes or until the top is browned. 

  9. Let the potatoes rest for 15 minutes before serving. 

potatoes au gratin, au gratin potatoes, scalloped potatoes, potatoes, side dish, easy side dish, potatoes au gratin recipe, coco and ash

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12 Comments

  • Reply
    Lauren Vavala | DeliciousLittleBites
    October 30, 2018 at 1:55 pm

    I love this recipe! What a great idea to use Greyere cheese! I’m going to try this next time I make au gratin potatoes!

  • Reply
    Jacqueline Debono
    October 30, 2018 at 2:09 pm

    I love potatoes cooked this way! I usually do roast potatoes but need to change that and do au gratin more often!

    • Reply
      Coco and Ash
      November 1, 2018 at 11:05 am

      Thanks!! These are definitely a winner! 🙂

  • Reply
    jen
    October 30, 2018 at 2:15 pm

    This looks amazing. I love gruyere. Best cheese ever!

    • Reply
      Coco and Ash
      November 1, 2018 at 11:04 am

      Thank you Jen!! I totally agree about the gruyere!

  • Reply
    Tayler Ross
    October 30, 2018 at 2:40 pm

    I love all kinds of potatoes, but especially these ones! So good!

  • Reply
    Pam Greer
    October 30, 2018 at 3:49 pm

    Oh my gosh, it’s been way too long since i’ve had Au Gratin Potatoes! Definitely putting your recipe on the menu next week!

    • Reply
      Coco and Ash
      November 1, 2018 at 11:03 am

      Thanks Pam!! They’re one of my favorites!

  • Reply
    Ellen
    October 30, 2018 at 4:05 pm

    Perfect color and so cheesy! My family will love these potatoes!

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