Wash the potatoes and cook with the skin on for about 25 minutes. Peel and press it through a potato press while it is still hot. Knead with flour, salt, pepper and nutmeg.
Roll out the dough and cut out 4 molds. Press the bottom into 4 well-greased molds (10-12 cm in diameter).
Preheat the oven to 180 ° C fan-assisted.
Peel the onions and cut into fine strips, dice the bacon. Sauté the clarified butter in a pan, fry the bacon first and then the onions.
Mix the eggs with the crème fraîche in a bowl, add a little salt and pepper, stir.
Cut the cheddar into strips. Spread the bacon onions and cheese on the dough. Spread the egg mixture on top.
Put the molds in the oven and bake the cake for about 20-25 minutes.