Onion And Potato Soup

• 4 potatoes
• 4 dutch oven over low heat
• 2 garlic (cloves)
• 2 bay leaves
• 700 ml water
• 950 ml chicken broth
• 110 gr prosciutto
• 55 gr romano cheese (grated)
• 45 gr butter
• 3 gr parsley (chopped fresh)