Peel, wash and chop the potatoes. Cook in boiling salted water for about 20 minutes until soft
Cut and wash the broccoli stems and florets. Cook broccoli in boiling salted water for 4-6 minutes, drain and drain. Cut cabanossi into slices. Melt 20 g butter in a saucepan. Add flour while stirring and sweat briefly. Deglaze with 150 ml milk while stirring, bring to the boil and simmer for about 5 minutes. Season to taste with salt. Stir in 25 g cheese
Drain the potatoes. Add 25 g butter and 200 ml milk and mash with a potato masher until mashed. Season to taste with salt and nutmeg. Put the mashed potatoes into a casserole dish, spread smooth and press a rim up
Mix broccoli, cabanossi and béchamel sauce and spread on the mashed potatoes. Sprinkle with 50 g cheese and hazelnuts. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 30 minutes. Take out and serve immediately