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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Simple to make and absolutely delicious!! Thanks again for a winner Jenn!
Jenn…The recipe calls for 1 1/2 teaspoons salt…is that coarse kosher salt…or fine sea salt…. I know it makes a difference in the taste. Just need guidance about the kind of salt…help?!
Hi Annie, It’s fine sea salt. My recipes all call for fine sea salt/table salt unless otherwise specified. Hope that clarifies!
Not sure why now, but I have always been intimidated by the idea of making au gratin potatoes from scratch. Maybe it is the fact that many recipes call for the mandolin? While I do own one, it terrifies me so I don’t go near it.
Made this last night and it was so much better than even the renditions you might get from a high end steak house. Very simple to make and the moment the dish came out of the oven perfectly brown on top and sizzling around the edges was such a moment of pride.
Thank you, Jenn for all your amazing recipes!
Could I double the recipe and bake in a tin baking pan?
For the best results and most even cooking, I’d bake them in two separate 8-inch baking pans, but you can get away with using one 9 x 13-inch dish. Hope that helps!
I did a test run at this last night in prep for Christmas. Good all around comments. I had a bit of a time finding the cheese though. I did find a grocery near that had both kinds of cheese in the recipe and bought a small slice of the Parmigiano Reggiano. This is probably a bit on the low class side but they did have a 16oz container of finely grated Parmigiano Reggiano at Costco. Yes, I bought it and used it. The potatoes turned out delightful. I was surprised at how long they took in the oven. I did slice them quite thin but they still took over an hour to bake.
Hi Jen – Love your recipes, they are usually my holiday go-to! I made these last night to test out before Christmas Eve dinner and I followed your recipe closely. I found that I just needed to reduce the amount of heavy cream by about 1/4 c and allowed the potatoes to cook for the full 75 minutes. I even made them a few hours ahead of time and covered with plastic wrap to see how that would work for me and I’m thrilled to say they turned out great! I’m going to be cooking these Friday night for about 20 people. I like your suggestion of cooking these in separate batches for more even cooking, but I was wondering if you think I should stick to the 2qt baking dish and just make 3 batches, or if you think I could make two batches using a 3 3/4 quart baking dish and just increase the ingredients slightly? I’d hate to tweak too much since following your recipe yielded great results, so I was hoping you could weigh in. Would the amount of cooking time increase, even if baking 3 2-qt batches at the same time? Thanks!
Hi Andi, so glad you like the recipes! You could probably get away with making two of the batches in the 3-3/4-quart baking dish but you’ll get the best results and most even cooking by using three 2-quart baking dishes. Regarding cooking time, it will be slight but you may need to keep them in the oven for a bit longer simply because the oven will be more crowded. Hope that helps!
Haven’t made this yet but would like to for Christmas. Wondering if I used a 13×9 dish should I double recipe? Any advice greatly appreciated.
Hi Renee, You could get away with it, but would suggest using two 8-inch baking dishes for more even baking. Hope you enjoy if you make it!
Can I ask your advice? If you were to double the recipe, how would you adjust proportions and baking time? I’d like to make this for Christmas dinner (15 people). Many thanks! I make your recipes all the time—delicious and easy to follow. Your cookbook is wonderful!
Hi Betsy, So glad you like the recipes! 🙂
If you want to double this, for the best results, I’d bake it in two separate pans. That ensures that it will cook evenly. They may take a few extra minutes in the oven, but not much. Hope that helps and that you enjoy!
The best potato gratin I’ve ever had!! I made this for a dinner party for 6 – a big hit!!
If I wanted to increase the potatoes to 5 instead of 4, how much more would I have to increase the other ingredients? Don’t really want to make 2 casseroles. Thx so much.
Kathy
Hi Kathy, I would just increase the cream so that it covers all of the potatoes. Also, make sure that you don’t pile everything too high or it could bubble over and make a mess of your oven. Hope that helps!
Thank you so much! Happy Holidays!!