Potatoes au Gratin — Wisconsin Style

Creamy, cheesy one-pan comfort inspired by classic French technique

There are certain side dishes that feel like they belong at every table — holidays, Sunday dinners, potlucks, and cozy weeknights alike. Potatoes au Gratin is one of those recipes.

Traditionally known as gratin dauphinois in France, this dish is built on simple ingredients and thoughtful technique. Thinly sliced potatoes slowly cook in a creamy base until tender, rich, and deeply comforting.

Here in Wisconsin, though, we tend to lean a little more generously into cheese — and that’s exactly what this version does. It follows classic French cooking methods by building the sauce in the same pan and allowing the potatoes to naturally thicken the dish as they cook. The final layer of melty cheese gives it a warm, Midwest finish that feels both rustic and indulgent.

Best of all, everything happens in one pan — making this recipe as practical as it is comforting. If you love creamy comfort food recipes like my Chicken & Dumplings, this cheesy potato gratin will feel right at home on your table.

Ingredients

• 1½ pounds yellow potatoes (such as Yukon Gold)
• 2 cups vegetable broth
• 2–3 garlic cloves, grated
• 1 tablespoon Chinese mustard
• 4 ounces mascarpone cheese
• ¼ cup freshly grated Parmesan cheese
• 1 teaspoon salt
• ½ teaspoon ground white pepper
• 1 cup heavy cream, gently warmed
• 4–8 ounces shredded marbled jack cheese

How to Make Potatoes au Gratin

1. Preheat the oven
   Preheat oven to 375°F.
2. Prepare the potatoes
   Slice the yellow potatoes ⅛-inch thick using a knife, mandoline, or food processor slicing blade.
   Leave the skins on for rustic texture, or peel if preferred.
   Do not rinse the slices, as the natural starch helps thicken the sauce.
3. Build the creamy base
   In a 3.5-quart enameled cast iron pan, combine mascarpone cheese, vegetable broth, grated garlic, Chinese mustard, salt, and white pepper.
   Cook over medium heat, stirring gently until the mascarpone melts and the mixture becomes smooth.
4. Add the potatoes in layers
   Add potato slices a handful at a time, gently stirring between additions to coat evenly and prevent clumping.
5. Bring to a gentle boil
   Once all potatoes are added, bring the mixture to a gentle boil, stirring occasionally to prevent sticking.
   The sauce will begin to naturally thicken as the potatoes release their starch.
6. Add Parmesan cheese
   Stir in the freshly grated Parmesan until fully incorporated.
7. First bake
   Bake uncovered for 30 minutes, until potatoes are just tender and most liquid has reduced.
8. Add warm cream
   Pour the gently warmed cream evenly over the potatoes.
   Bake 15 more minutes.
9. Add the Wisconsin cheese finish
   Top evenly with shredded marbled jack cheese.
   Bake another 15 minutes, until melted, bubbly, and lightly golden.
10. Rest before serving
    Allow the dish to rest 20–30 minutes before serving so the sauce can set and become luxuriously creamy.

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Ingredient Swaps & Notes

Vegetable broth → replace 1:1 with chicken broth
Chinese hot mustard → replace 1:1 with Dijon mustard
Mascarpone → replace 1:1 with cream cheese
Fresh Parmesan → can use canister Parmesan (texture may be slightly grainier)
White pepper → replace 1:1 with black pepper
Marbled jack → replace 1:1 with cheddar

Serving Suggestions

Serve alongside:

• Roast chicken
• Holiday ham
• Grilled steak
• Pork loin
• Turkey
• A crisp green salad

This dish pairs especially well with meals that benefit from a rich, creamy side.

Make Ahead & Holiday Planning Tips

This recipe is ideal for preparing ahead during busy holiday meals or gatherings.

To make ahead:
Prepare the recipe through the first bake step. Allow to cool slightly, then cover and refrigerate up to 24 hours.

When ready to serve:

• Remove from refrigerator 30 minutes before baking
• Add the warm cream
• Continue baking as directed

For larger gatherings, the recipe can be doubled and baked in a wide, shallow dish to ensure even cooking.

Storage & Reheating

Store leftovers covered in the refrigerator for up to 4 days.

To reheat:

• Cover with foil
• Bake at 325°F until heated through
• Add a splash of cream or broth if needed
• It can also be microwaved as well.

Leftovers develop even deeper flavor the next day.

Part of My Cooking School Series

Understanding How Potatoes Naturally Thicken Sauces

This recipe uses a classic technique where thinly sliced potatoes release starch as they cook, naturally thickening the sauce without added flour.

You can see similar sauce-building techniques used in recipes like Chicken & Dumplings or creamy dressing bases such as my Homemade Ranch Dressing.

Learning how starch behaves in recipes like this builds confidence in creating creamy sauces, gravies, stews, and many comforting dishes.

Mastering this simple concept opens the door to a wide range of classic cooking skills.

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