Potatoes Au Gratin
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Tender, golden, and irresistibly creamy, potatoes au gratin is the kind of crowd-pleasing side that makes any meal feel special.
This wonderful classic potatoes au gratin recipe is one of my go-to Thanksgiving side dishes, but it’s also perfect for any special dinner. It involves layering thinly sliced potatoes with heavy cream and grated cheese in a casserole dish, and then baking until the cream thickens and blankets the potatoes in a rich, creamy sauce. This dish is definitely worthy of a special occasion, but honestly, enjoying this au gratin potatoes recipe feels like a special occasion all on its own.
For more easy gratin recipes to round out your dinner rotation, check out my cauliflower gratin and Brussels sprouts gratin.
“I only gave this five stars because I couldn’t give it 10 stars. This may be my favorite side dish ever. It is amazing!”
What You’ll Need To Make Potatoes Au Gratin
- Russet Potatoes: With their high starch content, russets soak up the cream beautifully and bake into soft, melt-in-your-mouth layers. They’re the best choice for this dish. Skip the Yukon Golds here—they won’t give you the same texture.
- Heavy Cream: The secret to the luscious, velvety sauce. You might be tempted to swap in milk or half-and-half, but don’t—this recipe really needs heavy cream to thicken properly.
- Parmigiano Reggiano: Adds a salty, nutty depth that melts right into the potatoes, creating incredible flavor and texture. Be sure to use true Parmigiano Reggiano. If you can’t find it, Pecorino Romano makes a great substitute.
- Salt, Pepper & Thyme: These simple seasonings bring everything to life—the thyme is optional but adds a subtle earthiness that pairs perfectly with the creamy potatoes and cheese.
- Jump to the printable recipe for precise measurements
Step-by-Step Instructions
Step 1: Slice the potatoes. It’s key to cut the potoates as thinly and uniformly as possible. You can use a mandoline slicer if you have one, but I never bother.
Pro tip: When slicing wobbly potatoes, it helps to cut a thin slice along the length of the potato, then turn the potato cut-side down on a cutting board so that it sits flat.
Step 2: Season the potatoes. Place the potatoes in a large bowl and toss with the salt and pepper. Be sure the potatoes are evenly coated.
Step 3: Assemble the gratin. Butter a 2-quart baking dish. Arrange some of the potato slices, with their edges overlapping, in a single layer on the bottom of the dish. Sprinkle a quarter of the cheese over the potatoes.
Pour a quarter of the cream over top. Repeat with the remaining potatoes, cheese, and cream, forming four layers. Pour any leftover cream over the top—you want to use it all.
Step 4: Bake. Bake the gratin for 60 to 75 minutes, until the potatoes are tender when pierced with a knife and golden brown on top. Don’t cover the dish with foil — you want that beautiful color to develop. The top should be nicely golden by the time it’s done, but if you’d like a little extra browning, pop it under the broiler for a minute or two (just keep a close eye on it so it doesn’t burn). Sprinkle with fresh thyme leaves, if you like, and serve warm.
More Potato Side Dishes You May Like
Potatoes Au Gratin
With layers of thinly sliced potatoes baked in cream and melted cheese, this potatoes au gratin is the ultimate comfort food.
Ingredients
- Butter to grease the baking dish
- 2½ pounds Russet potatoes (3 to 4), peeled and sliced very thin
- 1½ teaspoons salt
- ¼ teaspoon freshly ground black pepper
- 1 cup (4 oz) finely grated Parmigiano-Reggiano
- 2¼ cups heavy cream
- Fresh thyme, for serving (optional)
Instructions
- Preheat the oven to 350°F and set an oven rack in the middle position. Grease an 8-inch (or 2-quart) baking dish with butter.
- In a large mixing bowl, toss the potatoes with the salt and pepper until evenly coated.
- Arrange some of the potato slices, edges overlapping, in a single layer on the bottom of the prepared baking dish. Sprinkle a quarter of the cheese over the potatoes, and then pour a quarter of the cream over the cheese. Repeat with the remaining potatoes, cheese, and cream, forming 4 layers. Pour any leftover cream over top.
- Place in the oven and bake, uncovered, for 60 to 75 minutes, or until the potatoes are tender when pierced with a knife and golden brown on top. Let the dish settle on the counter for about ten minutes. Sprinkle with fresh thyme, if using, and then serve.
- Make Ahead: If absolutely necessary, this dish can be assembled a day ahead and covered tightly with plastic wrap (pressing the wrap directly against the potatoes so they don’t discolor too much). Store in the refrigerator and bake before serving. Note that the potatoes on top will still discolor a bit in the fridge, but it shouldn't be noticeable after baking.
Nutrition Information
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- Per serving (8 servings)
- Calories: 399
- Fat: 29 g
- Saturated fat: 18 g
- Carbohydrates: 28 g
- Sugar: 3 g
- Fiber: 2 g
- Protein: 9 g
- Sodium: 518 mg
- Cholesterol: 101 mg
This website is written and produced for informational purposes only. I am not a certified nutritionist and the nutritional data on this site has not been evaluated or approved by a nutritionist or the Food and Drug Administration. Nutritional information is offered as a courtesy and should not be construed as a guarantee. The data is calculated through an online nutritional calculator, Edamam.com. Although I do my best to provide accurate nutritional information, these figures should be considered estimates only. Varying factors such as product types or brands purchased, natural fluctuations in fresh produce, and the way ingredients are processed change the effective nutritional information in any given recipe. Furthermore, different online calculators provide different results depending on their own nutrition fact sources and algorithms. To obtain the most accurate nutritional information in a given recipe, you should calculate the nutritional information with the actual ingredients used in your recipe, using your preferred nutrition calculator.
Gluten-Free Adaptable Note
To the best of my knowledge, all of the ingredients used in this recipe are gluten-free or widely available in gluten-free versions. There is hidden gluten in many foods; if you're following a gluten-free diet or cooking for someone with gluten allergies, always read the labels of your ingredients to verify that they are gluten-free.
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Hi Jenn-
I love your recipes and can’t wait to try more of them! My family can’t get enough of your beef stew recipe.
Can these potatoes be made in advance?
Hi Lauren, Glad you like the recipes! Yes, you can either prep these in advance (see instructions at the end of the recipe) or make them ahead and reheat. To reheat, I’d pop them in the a 325 oven for 20 to 30 min, or until hot.
Can you make this the day before? If so, suggested instructions please.
Hi Lynn, Yes, you can either prep these in advance (see instructions at the end of the recipe) or make them ahead and reheat. To reheat, warm in a 325 oven for 20 to 30 min, or until hot. Enjoy!
Made this to serve with the beef tenderloin recipe with wine sauce and IT WAS A HIT!! Doubled the recipe as written and it was delicious! All 18 guests said the potatoes (and beef tenderloin) was the best they have ever eaten! I have made many of your recipes, and without fail, all have been delicious!
I have your cookbook too which is awesome! I never feel anxious anymore when looking to try a new recipe for guests…you make it easy! Thank you.
☺️
Made this.about doubled the Parmesan.spectacularly good.
I prefer to use metric measurements. Is there a simple way to convert your recipes? Thanks
Hi Frances, I just added metric conversions to this recipe. To view them, scroll down to the recipe and immediately under the recipe title on the right side, you’ll see a little toggle. If you move it from “cup measures” to metric, you’ll see measurements that will work for you. Hope you enjoy the potatoes!
I love Au Gratin potatoes. I can’t wait to try these. But if I need to double the recipe should I just use a deeper casserole dish or make two batches using the shorter gratin casserole dishes? Thanks so much.
Hi Belinda, I’d make them in two separate baking dishes – they will cook more evenly that way. Enjoy!
That makes sense to me. Thank you.
Hi Jenn- I’m making this dish with your beef tenderloin recipe (which cooks at 400 F) and I only have one oven, could you recommend a way to make them come out at the same time? Thanks!
Hi Beth, you could get away with baking these at a higher temp. Keep in mind that they may need a little less time in the oven (and while you want them to brown on the top, if they are getting too browned before they are cooked through, you can cover the dish with foil for a portion of the baking).
Easy and super tasty. Fail proof.
Wow! I made this recipe for Thanksgiving and it was a hit! Everyone initially thought I had mastered a complex cheese sauce, but were amazed when I explained how simple the recipe was. In retrospect, I wish I had allowed them to think the latter! I doubled the recipe and added a touch of fresh garlic and it came out great. This will now be my go to recipe for special occasions or just a decadent treat now and again.
I made this for the first time on Thanksgiving. I chose this recipe because of it’s the simplicity. I opted for the highest quality cheese I could find since there were so few ingredients (wedge of a big wheel). Huge hit! Will make again and double the recipe. Thank you for this amazing recipe. It’s a keeper.