Serves: 4 people Difficulty ': Easy Preparation time: 1 hour INGREDIENTS 800gr./1kg. potatoes 250gr. 100g button mushrooms. grated cheese 1 cup milk 60g. 50g butter 1 egg. white flour olive oil 1 clove garlic 1 tablespoon chopped parsley salt pepper PROCEDURE -------------------------- Boil the potatoes with the peel When they are cooked peel them and pass them through a sieve and collecting the pulp in a bowl.