Mushroom Cups

• 2 egg yolks
• 170 gr mushrooms (chopped)
• 120 gr onions (chopped)
• 110 gr melted butter
• 85 gr mozzarella cheese (grated)
• 60 gr parmasean cheese (grated)
• 40 gr margarine
• 14 gr parsley (chopped)
• 3 gr salt
• 8 slices bread (sliced white)