A rösti bake works because the potatoes go into the mixing bowl raw, not pre-cooked. We grate 800 g of potatoes for 6 seconds at speed 5, tip them into a sieve and actively press out the starch. That step alone determines whether the bake develops a crispy rösti texture or collapses into a soggy potato mash.
We have been cooking this recipe for years, mostly on Sunday evenings when one pot, one baking dish and four eggs have to do. The result is a cross between a Swiss rösti and a bake: at the bottom, firmly bound grated potato with pepper and onion; on top, four eggs with runny yolks that we only add in the final 10 minutes. Bake the eggs from the start and you get fully set yolks and lose the whole point of the recipe.
Rösti Bake with Eggs, Thermomix®
Ingredients 0 / 17 ✓
- 200 g alpine cheese (e.g. Bergkäse)
- 800 g potatoes
- 1 red pepper
- 2 garlic cloves
- 1 chilli
- 1 onion
- 30 g butter
- 1 tsp salt
- 250 g Greek yoghurt (10% fat)
- 1 tbsp cornflour
- 2 tsp dried lovage
- 1 pinch nutmeg
- 1 tsp sweet paprika
- 1 tsp vegetable stock powder
- 1/2 tsp freshly ground pepper
- 4 eggs
- 1 bunch parsley
Instructions 0 / 14
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1
Preheat the oven to 180°C fan.
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2
Add the alpine cheese in pieces to the mixing bowl and chop for 8 seconds / speed 8, then set aside.
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3
Peel the potatoes, add in pieces to the mixing bowl and chop for 6 seconds / speed 5, then transfer to a sieve and leave to drain.
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4
Wash the pepper, deseed it and cut into strips.
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5
Peel the garlic and add to the mixing bowl together with the chilli.
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6
Peel the onion, quarter it, add to the mixing bowl and chop for 5 seconds / speed 6, then scrape down with the spatula.
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7
Add the butter to the mixing bowl and steam for 3 minutes 30 seconds / Varoma / speed 1 without the mixing bowl lid.
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8
Add the salt, yoghurt, cornflour, lovage, nutmeg, paprika, vegetable stock powder and pepper to the mixing bowl and mix for 10 seconds / speed 3.
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9
Press the potatoes in the sieve a little more with a spoon, then transfer to a bowl together with the pepper strips.
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10
Pour the sauce over, mix everything well and pour into a baking dish.
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11
Bake on the middle shelf of the oven for approx. 40 minutes.
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12
Remove the rösti bake from the oven, use the back of a tbsp to press four wells into the bake and crack one egg into each well.
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13
Bake for a further 10 minutes, until the egg whites are set.
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14
Wash the parsley, shake dry, pick the leaves and scatter over the rösti bake.
Video
Nutrition per serving
Why the potatoes go into the mixing bowl raw
Classic Swiss rösti are grated from raw or parboiled potatoes, fried in butter and held together by their own starch. In this bake we follow the same principle, but swap the frying pan for the oven and the grater for the Thermomix®. At 6 seconds at speed 5 we get coarse shreds rather than puree. That matters: go longer or higher and the blades break down the cell walls, the potato juice rushes out and you end up with a pulpy mass. Speed 5 is exactly what Swiss cooks call “roughly grated”.
The shreds then go into a sieve. We wait two or three minutes for the first water to drain off on its own, then press out the rest with the back of a tablespoon. If you want to go further, wrap the potatoes briefly in a clean tea towel and wring them out. Either way, a milky liquid collects at the bottom of the sieve. That is the potato starch. It has to come out, otherwise it will waterlog the bake from the inside.
We chop the alpine cheese first, 8 seconds at speed 8, and set it aside. Then garlic cloves, chilli and a quartered onion go into the bowl, 5 seconds at speed 6. With 30 g of butter we steam the mixture for 3 minutes 30 seconds at Varoma / speed 1 without the mixing bowl lid. That open mode is exactly why onions in the Thermomix® do not taste raw: the moisture evaporates, the sharpness fades and the garlic turns sweet.
The yoghurt sauce as a binding agent
On top of the sweated vegetables we add 250 g Greek yoghurt with 10% fat, 1 tbsp cornflour, 2 tsp lovage, 1 tsp sweet paprika, 1 tsp vegetable stock powder, a pinch of nutmeg, 1 tsp salt and 1/2 tsp pepper. 10 seconds at speed 3 is all it takes. We want to mix the sauce, not whip it. Yoghurt with 10% fat is not a luxury here but a functional choice. Low-fat yoghurt releases water in the oven because the protein sets at 70°C and expels the free liquid. At 10% fat the binding stays stable and we get a creamy layer between the potato shreds.
The cornflour is the second stabiliser. It binds the residual moisture we cannot fully press out of the potatoes, and it turns the yoghurt into a sauce that does not split in the oven. 1 tbsp is the minimum: less and the bake looks soupy, more and the texture turns rubbery. Dried lovage rather than fresh parsley is intentional. In the oven at 180°C fresh herbs turn dark and bitter, while dried lovage only releases its characteristic aroma once exposed to heat.
Layer, bake, add the eggs
The pressed potato shreds go into a large bowl with the sliced pepper, then the sauce from the mixing bowl goes over the top. Mix everything well, transfer to a greased baking dish and smooth the surface. A dish roughly 25 by 18 cm fits 4 servings; the layer should be around 4 cm deep. Stacked higher, the lower layers take too long to cook through and the top dries out.
At 180°C fan we bake the dish for 40 minutes on the middle shelf. Three things happen at the same time: the starch from the potatoes gelatinises and binds the mixture, the yoghurt thickens and the alpine cheese starts to melt. For a crispier top, switch to 200°C top and bottom heat or turn on the grill briefly for the last 5 minutes.
Then comes the key moment for the eggs. We take the bake out of the oven, press four wells into the hot surface with the back of a tablespoon, roughly 4 cm across and 2 cm deep, and crack one egg directly into each well. Back into the oven for a further 8 to 10 minutes at 180°C. The egg whites set completely in that time, while the yolks stay runny or just soft-set depending on how early we pull it out. At 8 minutes the yolk is still glossy; at 10 minutes it is just firm. Bake longer and you end up with hard-boiled eggs on top of a bake, and that is not the effect we are after.
Two things that can go wrong
Watery bake despite the baking time. If liquid is pooling at the edges after 40 minutes, the potatoes were not pressed out enough. We have experienced this ourselves several times: the shreds look dry after the sieve because the starch collects between the layers. Press for two minutes longer or use the tea towel method. With particularly starchy varieties such as Bintje or Adretta, adding an extra 1 tbsp of cornflour to the sauce can also help.
Fully set yolks. This happens when the wells are too shallow or the bake is too hot. The wells need to be deep enough to shield the yolk from the hot surrounding mixture. We leave the bake to rest on the worktop for 1 to 2 minutes after the 40 minutes before we add the eggs. That lets the surface temperature drop slightly so the egg cooks more slowly from the outside in.
Variations we enjoy
With bacon. After the cheese, briefly fry 100 g of diced bacon in the mixing bowl, 3 minutes / Varoma / speed 1 without the lid, before adding the onions. The bacon renders its fat, in which the onions then sweat, and the bake gains a hearty depth.
With smoked salmon. Instead of bacon, lay 150 g of smoked salmon in strips over the bake just before adding the eggs. The salmon warms through in the final 10 minutes without overcooking or turning fishy.
With spinach. Mix 200 g of defrosted, well-squeezed leaf spinach into the yoghurt sauce. Pressing out the spinach is essential: it holds even more water than potatoes, and that extra moisture must not go into the bake.
Swap the cheese. Replace the alpine cheese with a mature Gouda, Cheddar or a strong Comté. We stick to aged hard cheeses because they release less water and do not disturb the binding. Fresh cheese or Mozzarella are not good substitutes as they liquefy in the oven.
What to serve alongside
The rösti bake is filling, so a salad is all you need. We like it best with a classic lamb’s lettuce or a quick coleslaw from the Thermomix®, whose acidity balances the richness of the bake nicely. For more of a kick, serve a bowl of soured cream or a tzatziki made in the Thermomix®. On a Sunday evening, when this bake regularly appears on our table, a bowl of tomato soup as a starter rounds things off well.
Leftovers and the next day
Leftovers keep covered in the fridge for 2 days. We reheat the bake at 160°C fan for 12 to 15 minutes, not in the microwave. Microwave heat makes the potatoes soggy because it releases the bound water again. In the oven the structure stays intact and the cheese melts again.
Also good with: soured cream and cucumber salad.
Freezing works only partially. The potato shreds survive defrosting, but the yoghurt separates, and the eggs should always be added fresh anyway. If you want to prepare ahead, freeze the base alone (without eggs) and add them after reheating in the final 10 minutes.
For more bake ideas from the Thermomix®, take a look at our potato gratin, pasta bake and vegetable bake.
