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    Home » Sides » The Best Au Gratin Potatoes Recipe

    The Best Au Gratin Potatoes Recipe

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    Thinly sliced au gratin potatoes recipe with onions, garlic, and thyme in a creamy white cheese sauce baked to bubbly perfection.

    au gratin potatoes in a casserole dish on a dark background
    Au gratin potatoes in a casserole dish

    Potatoes of all kinds show up on our dinner table more than once a week. This easy au gratin potatoes recipe is a favorite of everyone, even the kids. While it's something you need to think about ahead of time, it's still at the top of the list for sides. All that creamy, cheesy goodness is hard to pass up. If you haven't tried making this yet, you're going to want to give it a go!

    Au gratin is a French culinary term defined as a dish that is topped with breadcrumbs or cheese and browned on top. Some other examples of this include vegetables and fish. The potatoes in this dish are sliced thin and coated with a cheese sauce that includes softened onions, garlic, and fresh thyme leaves. It's then topped with more cheese and baked, covered, for 30 minutes, then uncovered for another 20 - 25 or until golden.

    One of the best tools you can use for this dish is a mandoline, although a chef's knife will work as well. You can see a review of the Prepworks by Progressive Mandoline I've done if you're wondering if this is a good purchase for you. Personally, I love it. It makes slicing so many different things that much easier.

    creamy potatoes on a white plate with a fork
    creamy potatoes on a white plate with a fork

    If you try it out, let me know how it goes in the comments or on Instagram, Facebook, or Pinterest.

    potatoes in a casserole dish on a dark background
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    5 from 1 vote

    How to make au gratin potatoes

    Thinly sliced potatoes in a creamy white cheese sauce baked to perfection.
    Course Side Dish
    Cuisine American
    Keyword Potatoes
    Prep Time 20 minutes
    Cook Time 55 minutes
    Total Time 2 hours 15 minutes
    Servings 6 people

    Equipment

    • mandoline
    • cheese grater
    • saucepan
    • Cutting board
    • Chef's knife
    • large bowl

    Ingredients

    • 2 pounds Yukon potatoes
    • ¼ cup butter
    • ½ white onion diced
    • 3 garlic cloves minced
    • ⅓ cup all-purpose flour
    • 1 cup whole milk
    • 1 cup heavy cream
    • 2 cups white cheddar shredded
    • 1 teaspoon salt
    • ½ teaspoon pepper
    • 2 teaspoons fresh thyme leaves

    Instructions

    • Preheat the oven to 400°. Peel and thinly slice the potatoes with a mandoline or chef's knife. Dice the onion, mince the garlic, and grate the cheese. Grease a 9x13 inch casserole dish.
    • Heat a saucepan on medium-low and add the butter, onions, and garlic. Sauté until soft, about 3 minutes. Cover with the flour, stir and allow to cook for 2 more minutes.
    • Pour in the milk, cream, salt, pepper, and thyme and allow to simmer for about 5 minutes, or until it starts to thicken. Remove from the heat and add the cheese. Stir to combine until it all melts into a cheesy sauce.
    • Put the sliced potatoes in a large bowl and slowly pour the cheese sauce over the top. Stir until all the potatoes are covered in the sauce. Pour this in the casserole dish, cover with aluminum foil, and bake for 30 minutes. Remove the foil and cook for an additional 25 minutes.

    Notes

    **Notes** 
    Use a combination of different soft cheeses to create a different flavor. 
    Use half and half or whole milk instead of the heavy cream to make it a bit healthier. 
    « Creamy Chicken Marsala
    How To Use a Prepworks by Progressive Mandoline Slicer - Review »

    Reader Interactions

    Comments

    1. Food Blog Names

      March 16, 2021 at 7:08 am

      5 stars
      Hi! I love how informative and great your articles are. Can you recommend any other Food Blog Names or blogs that go over the same topics? Thanks a lot!

      Reply
      • Lindsey

        March 19, 2021 at 11:51 am

        I'm glad you're enjoying them! There are so many great food blogs out there. I suggest doing a search for the recipe you're looking for to get some great ideas.

        Reply

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    Hi, I'm Lindsey! Learn how to gain confidence in the kitchen with how-to tips and tricks, product reviews, and wellness articles to build a foundation of culinary skills. →

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