Potato Cake Lorraine Style: The Quiche-Gâteau Mashup
I stumbled onto this idea scrolling through an Italian food blog at 11pm — a mashed potato bake built like a quiche Lorraine, layered with ham, cheese, and smoked bacon, then finished with a poured custard on top. I almost didn’t try it because it sounded like it shouldn’t work. But the original author mentioned she once brought it to a party and the kitchen staff ate the entire thing before it ever made it to the buffet table — and that detail alone had me preheating the oven.
This bake gives you the comfort of creamy mashed potatoes with the savory punch of a quiche — smoky bacon, melted cheese, and a lightly spiced egg custard that sets into a golden crust. It comes together in about 45 minutes, uses pantry staples, slices cleanly when cool, and holds up brilliantly for packed lunches the next day.
Pro Tip
The mistake most people make: they pour the egg custard over warm potatoes straight from the oven, and it sinks right through instead of sitting on top and setting into a distinct layer. Let your assembled potato base rest uncovered for 5 minutes before adding the custard — the surface firms up just enough to hold the liquid. Then pour slowly from the center outward. You’ll get a clean, defined top layer that browns evenly rather than disappearing into the mash.
Use smoked bacon lardons or diced smoked bacon — pre-cubed packs from the supermarket work perfectly and save chopping time. For the cheese layer, any good melting cheese works: sliced provolone, Gruyère, or even a sharp cheddar all hold up well. Avoid fresh mozzarella here — too much moisture. Cooked ham from the deli counter slices cleaner than pre-packaged if you can get it.
Potato Cake Lorraine Style: The Quiche-Gâteau Mashup
6
servings20
minutes30
minutes390
kcal10
minutes1
hourIngredients
2.2 lbs starchy potatoes (about 1 kg), skin on
3.5 oz smoked bacon lardons (100 g)
2 large eggs
1.75 oz unsalted butter (50 g), divided
1/3 cup whole milk (80 ml), plus a splash for the mash
3 tbsp all-purpose flour
5–6 slices cooked ham
4–5 slices provolone or Gruyère (about 3.5 oz / 100 g total)
1 medium tomato, thinly sliced
1/2 tsp fine salt, plus more to taste
1/4 tsp black pepper
1/4 tsp freshly grated nutmeg
1 pinch chili flakes (optional)
Directions
- Boil the potatoes whole, skin on, until a knife slides through with zero resistance — about 20 minutes. Keeping the skin on prevents the potatoes from absorbing too much water, which would make your mash loose and hard to layer.
- Peel while hot. Mash immediately with half the butter and a splash of milk — just enough to make it smooth but not runny. The mash should hold its shape when pressed with a spoon. If it slumps and spreads, it’ll be difficult to build clean layers.
- Cook the bacon lardons in a dry skillet over medium heat for 3–4 minutes. You’re listening for a steady sizzle that softens into a quieter crackle — that’s the fat rendering. Don’t drain it: that smoky fat goes into the custard.
- Whisk together the second egg, flour, milk, remaining melted butter, salt, pepper, nutmeg, and chili flakes until smooth. Add the flour gradually and whisk constantly — lumps at this stage won’t cook out later.
- Butter a 9×7 inch (22×18 cm) baking dish and press half the mash into an even layer. Use the back of a wet spoon to smooth it — the mash shouldn’t stick.
- Layer ham slices, then cheese, then the remaining mash on top. Press gently so the layers stay distinct — you want to see them when you slice.
- Rest the assembled dish for 5 minutes, then pour the custard slowly over the surface. Scatter the bacon and its rendered fat on top, then arrange tomato slices to finish.
- Bake at 425°F (220°C) for 25–30 minutes. It’s ready when the top is spotted with deep amber patches and the custard no longer jiggles at the center. Pull it out and let it cool for at least 10 minutes before slicing — the layers firm up significantly as it rests.
Variations
Swap the cooked ham for thinly sliced turkey breast if you want a lighter build — it works just as well between the potato layers. For a vegetarian version, skip the bacon entirely and stir a tablespoon of smoked paprika into the custard to keep that depth of flavor.
Serving Suggestions
A sharp green salad with a mustardy vinaigrette cuts through the richness cleanly. Pickled gherkins or cornichons on the side add a bright contrast that works especially well with the smoked bacon. It also pairs well with a simple tomato soup if you’re serving it as a main on a cold evening.
FAQ
Can I make this ahead of time?
Yes — and honestly, it’s better the next day. After testing three versions in my kitchen, I found that slicing it cold gives you much cleaner portions and the flavors settle into each other overnight. Reheat individual slices in a skillet over medium-low heat rather than the microwave to keep the crust texture.
My custard layer disappeared into the mash. What went wrong?
This is the most common issue with this recipe: the mash surface was too soft when you poured. The fix is simple — let the assembled dish sit uncovered for 5 minutes before adding the custard, and pour it slowly from the center. A slightly firmer surface holds the liquid long enough for it to begin setting in the oven.
What cheese works best if I can’t find provolone or Gruyère?
A sharp cheddar melts well and adds a slightly tangy note that actually plays nicely against the smoky bacon. Fontina is another solid option if you want something creamier. I’ve been curious whether a smoked cheese in the layers would double down on that Lorraine character — that’s a version I haven’t tried yet.
