Peel the potatoes, cut into 0.5 cm cubes and place in a bowl. Add the bell pepper and onions and mix gently. Add flour, parsley and cheese and mix well. Season with cayenne pepper, salt and a little black pepper to taste.
Grease a coated baking dish with a little butter. Spread the potato mixture evenly in it. Pour hot milk and cream over it and pour the remaining butter in flakes. Bake in the oven for about 1 hour until the surface is crispy / golden brown and the potatoes are soft. Serve immediately.