What is the difference between au gratin and scalloped potatoes?
Au gratin potatoes are a French-inspired baked dish made with thinly sliced potatoes, cream, and plenty of cheese layered throughout — and yes, if you’ve seen “gratin dauphinois” on a menu, that’s the same dish. The word “gratin” comes from the French verb gratter, meaning to scrape or grate, a nod to the browned, cheesy crust that defines it. The difference between au gratin and scalloped potatoes comes down to one thing: cheese in the layers. Scalloped potatoes are made with just a cream sauce, while au gratin takes it further by adding cheese directly into each layer, creating that signature golden, slightly crispy crust on top that nobody can resist. Same comfort food energy, but au gratin brings the drama.
Can I use bagged shredded cheese?
Short answer: don’t. Pre-shredded cheese is coated in starches and anti-caking agents that prevent it from melting smoothly, and you’re not going to find gruyere in a bag at the grocery store anyway. Just grab the grater — it takes five extra minutes and makes a real difference in a dish where cheese is the whole point.
Ingredients you’ll need
Russet potatoes are the move here. Their high starch content helps them absorb the cream as they cook, giving you that soft, almost silky texture in each layer. Waxy potatoes like red or Yukon gold hold their shape too well and won’t give you the same result.
Gruyere and medium cheddar — gruyere brings a nutty, slightly sweet depth that makes the dish feel elegant, and cheddar adds that familiar sharpness that makes it feel like comfort food.
Heavy cream is non-negotiable. Half and half or whole milk simply won’t do the job.
Freshly grated nutmeg is subtle, but it adds a warmth to the cream mixture that makes people wonder what that flavor is. Pre-ground works in a pinch.
Kosher salt gets used two ways here — mixed into the cream and sprinkled on the top layer before baking.
Fresh herbs are optional but highly recommended for finishing. Chives, thyme, or rosemary flowers all work beautifully and make the dish look as good as it tastes.
How to slice potatoes for au gratin
A mandoline is your best friend here — trying to achieve thin slices with a knife is way too time consuming and frustrating. Uniform thickness matters because uneven slices will take longer to cook, resulting in an unevenly done dish. If you’re not assembling right away, keep your sliced potatoes submerged in a bowl of cool water to prevent browning.
How to assemble au gratin potatoes
Start with a layer of cream on the bottom of your baking dish — this prevents the first potato layer from sticking and gets the cooking started from the bottom up. From there, the pattern is simple: potato, cream, cheese, repeat.
Use about ½ cup of the cheese blend per layer and don’t stress about making it perfect; the cream will settle everything into place as it bakes. Finish with your remaining cheese on top, sprinkle the last teaspoon of kosher salt over everything, and press it all down gently with your hands.
Baking tips for the perfect gratin
Start at 425°F covered tightly with foil — the high heat and trapped steam is what gets the potatoes cooking all the way through before the top has a chance to brown. After 40 minutes, pull the foil, drop the oven to 400°F, and let it go until the top is deeply golden, bubbly, and a knife slides through the center with no resistance. And whatever you do, don’t skip the rest. A full 40 minutes out of the oven before cutting allows the cream layers to set up so everything holds together when you slice into it. Cut too soon and it’ll be a delicious but soupy mess.
Serving, storage, and make-ahead tips
Au gratin potatoes pair beautifully with just about any protein — think roasted chicken, beef tenderloin, or a simple green salad if you’re keeping things light. Leftovers store well in the fridge for up to four days; reheat covered with foil in a 350°F oven until warmed through to keep the layers from drying out and sauce separating.
Au Gratin Potatoes (No Roux)
Description
This one is for the potato lovers. Four layers of paper-thin russet potatoes tucked into a nutmeg-kissed heavy cream with gruyere and cheddar melted throughout — no roux needed, just layer, bake, and try not to cut into it before the rest time is up.
Ingredients
Instructions
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Preheat oven: Preheat oven to 425°F.
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Shred cheese: Hand shred 4 ounces gruyere, hand shredded on a large grate and 4 ounces medium cheddar, hand shredded on a large grate using the large holes of a box grater. Combine and set aside.
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Mix cream: Whisk together 16 ounces heavy cream (1 small container), 2 tsp of the 3 teaspoons kosher salt, divided (2 tsp for cream mixture, 1 tsp for top layer), 1 pinch fresh cracked black pepper, and 0.3 teaspoons freshly grated nutmeg. Set aside.
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Slice potatoes: Using a mandoline, slice 5 russet potatoes, sliced ⅛-inch thin on a mandoline to ⅛-inch thick. If not assembling right away, keep slices submerged in cool water to prevent browning.
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Assemble: In an 11x9 casserole dish, begin with a layer of cream mixture, then layer potatoes, cream, and about ½ cup of cheese. Repeat for 4 layers total. Finish with remaining cheese and sprinkle the last teaspoon of 3 teaspoons kosher salt, divided (2 tsp for cream mixture, 1 tsp for top layer) over the top. Press down gently with your hands.
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Bake covered: Cover tightly with foil and bake for 40 minutes
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Bake uncovered: Remove foil, lower oven to 400°F, and continue baking until golden, bubbly, and a knife pierces through with no resistance.
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Rest: Rest for 40 minutes before serving. Garnish with 1 pieces fresh herbs for garnish (chives, thyme, or rosemary flowers) just before plating.
Note
An 11x9 casserole dish fits exactly 4 layers of ⅛-inch sliced potatoes. Do not use pre-shredded cheese — the anti-caking coating prevents proper melting. Hand shredding both cheeses right before assembling makes a noticeable difference.
