Peel and wash the potatoes and cut or slice them finely. Then layer in flakes in a greased casserole dish. Season 150 g cream and half milk with salt and pepper and pour over the potatoes. Bake in a preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for approx. 30 minutes
Wash the salmon and pat dry with kitchen paper. Sprinkle with lemon juice and let it steep a little. Clean the mushrooms and wash if necessary. Peel and finely chop the onions. Wash the thyme and, except for something to garnish, pluck it off.
Heat 1-2 tablespoons of butter in a large frying pan. Add the chanterelles and fry over a high heat for 2-3 minutes, turning. Brown the onions. Season with salt and pepper. Dust with flour and sauté briefly. Stir in 100 ml water, 100 ml milk, 100 g cream, broth and thyme, bring to the boil. Season the sauce to taste
Season salmon with salt and pepper and place on the potatoes. Spread chanterelles on top. Bake in the oven at the same temperature for about 25 minutes. Garnish with thyme