📌 Melting Franche-Comté Gratin: Potatoes, Smoked Sausage, and Creamy Cancoillotte

Posted 2 May 2026 by: Admin #Recipes

Prep Time

20 minutes

Cook Time

35 minutes

Total Time

55 minutes

Servings

4 servings

We often think that traditional gratins require hours of work, expert skills, and an available grandmother. In reality, this Franche-Comté gratin is prepared in less than an hour with just five ingredients on the counter. The only things it truly asks for: a good gratin dish and the patience to let the oven do its job.

Final result — The Franche-Comté gratin in all its glory: melting potatoes, smoked sausage, and golden cancoillotte all in one dish.

What you see on the plate is a layer of melting potatoes, almost candied in the sauce, with slices of smoked sausage that released all their aroma during cooking. The cancoillotte cheese has gratinated around the edges—that light caramel gold, slightly crunchy under the spoon, contrasting with the smooth cream in the center. The smell coming out of the oven? Gentle smoke, warm cheese, and a fleeting trace of nutmeg. A dish that makes no apologies.

Why you’ll love this recipe

✓No béchamel to watch over : The cancoillotte melts on its own in a bit of cream. Two minutes over low heat, a few stirs with a spatula—done. No lumps, no ruined roux.

✓The smoked sausage does the work for you : No need for deep seasoning. The smoked turkey sausage releases its aromas during cooking and flavors the potatoes layer after layer. A single ingredient that replaces an entire marinade.

✓A complete meal, no side dish required : A green salad is enough. No need to think about a starch, a separate sauce, or anything else. The gratin is already all of that at once.

✓It reheats beautifully : The next day at 180°C, 15 minutes covered with foil—it’s even better on the second day. The flavors have had all night to mingle.

Ingredient Notes

Ingredients

Few ingredients, spectacular result: that’s all you need for this Franche-Comté gratin.

Potatoes : Choose Charlotte or Amandine. Not Bintje—they turn into mash and you lose all texture. The Charlotte holds up well to pre-cooking and absorbs the sauce without disintegrating. 800g for 4 is a generous portion.
Smoked turkey sausage : We use a smoked turkey sausage instead of the traditional Morteau. Look for a whole smoked sausage, not pre-sliced circles in a tray—those dry out during cooking. If you find a wood-smoked version, even better: you’ll taste it in the dish.
Cancoillotte : A melted cheese from Franche-Comté, quite liquid, with a mild and slightly tangy taste. Plain or with garlic depending on your mood—garlic adds a bit more character. 150g seems like little, but this cheese grows in volume as it dilutes in the cream.
Light crème fraîche : Used to thin out the cancoillotte. Light works perfectly—the cancoillotte already brings enough fat. Exactly 10cl: enough for a coating sauce, not enough to drown the gratin.

The sausage first

Submerge the smoked turkey sausage in a pot of simmering water—not boiling, simmering. At a rolling boil, it shrivels and loses its juices to the water. At medium heat, it swells gently, the skin remains intact and taut. Thirty minutes of cooking. When you take it out, it’s firm and slightly plump—let it cool for five minutes before slicing. One centimeter thick per slice: too thin and they disappear in the gratin; too thick and they won’t cook correctly.

Potatoes in the meantime

Peel and cut into slices about 4mm thick, as regular as possible. Ten minutes in boiling salted water, no more. You want them just tender under a fork, with a bit of resistance in the center—if they break apart in the pot, the gratin will end up as mash. Drain gently without stirring too much. If you want onion, now is the time: slice it finely and sauté in a bit of butter until translucent and slightly amber, almost golden at the edges.

The sauce, two minutes flat

In a small saucepan over low heat: cancoillotte, crème fraîche, a pinch of nutmeg, and pepper. No salt—the sausage takes care of that. Stir gently until the cancoillotte melts completely. The final texture is smooth, coating, slightly stretchy when you lift the spatula. It smells of warm, mildly milky cheese. Remove from heat as soon as it’s smooth—no need to reduce.

Assembling the gratin

Preheat the oven to 200°C. Butter the dish. Start with a layer of potatoes—they should overlap slightly to leave no gaps. Place a few sausage slices on top, some onion if using, then a ladle of sauce. Repeat until ingredients are used up. The final layer always ends with the sauce: it’s what gratins the surface and creates the crust. Spread it to the edges of the dish—that’s where it browns first.

The oven does the rest

Twenty to twenty-five minutes at 200°C. You’ll know it’s ready when the edges sizzle—that little sound of bubbles popping against the ceramic—and the top takes on a light caramel color, not burnt, just golden. Two minutes under the broiler if you want a truly crunchy surface. Remove it and let it rest for five minutes before serving. This rest allows the sauce to set slightly: without it, it runs everywhere on the plate the moment you dive in with a spoon.

Tips & Tricks

Never pierce the sausage before or during cooking—all its juices will escape into the water and you’ll end up with something dry and tasteless
Pre-cooking the potatoes is not optional: without it, they stay hard in the center even after 25 minutes in the oven, and the sauce isn’t enough to fix that
Always let the gratin rest for 5 minutes out of the oven before serving—the sauce stabilizes and you get clean portions rather than a puddle on the plate

Close-up — The cancoillotte stretches between the potatoes—the kind of detail that silences a whole dinner table.

FAQs

Can this gratin be prepared in advance?

Yes, it’s actually recommended. Assemble the gratin the day before, cover with plastic wrap and keep in the fridge. The next day, bake directly at 200°C, adding 5 to 10 minutes to the cooking time. The flavors will have had time to blend—the result is often better than on the first day.

How to store and reheat leftovers?

The gratin keeps for 3 days in the refrigerator, covered. To reheat, 15 minutes at 180°C with a square of aluminum foil over the top—this prevents the surface from drying out. Freezing is possible: defrost 24h in the fridge then reheat in the oven, not the microwave.

Can the cancoillotte be replaced with another cheese?

Cancoillotte is truly what gives the light texture and tangy flavor to this gratin. If unavailable, a melted cheese like Laughing Cow mixed with a bit of cream can work in a pinch, but the result will be less refined. Grated Comté mixed with cream gives a richer, fattier version—different, but good.

What variety of potatoes should I use?

Charlotte or Amandine, waxy varieties. They hold up to pre-cooking and don’t turn to mush in the gratin. Absolutely avoid floury varieties like Bintje—they absorb too much moisture and result in a pasty texture.

Can this gratin be frozen?

Technically yes, but it’s not ideal. Cancoillotte tends to separate when thawed and potatoes soften. If you freeze it, do so before baking, thaw slowly in the fridge, and bake directly without re-thawing.

What to serve with this gratin?

A green salad is more than enough—arugula or lamb’s lettuce with a mustard vinaigrette to cut through the richness of the cheese. Since the gratin is already quite complete (starch + protein + cheese), it doesn’t need any extra side dishes.