Stuffed Meat Loaf

• 6 rectangle
• 4 mushroom stems
• 1 egg
• 1/2 cheese (shredded)
• 1/2 border around edges
• 230 gr beef chuck (ground)
• 160 gr seasoned mashed potatoes
• 130 gr pork (lean ground)
• 110 gr soft bread crumbs
• 60 ml milk