Easy Antipasto Chicken

• 1 mushrooms (whole)
• 800 gr chicken (pieces)
• 120 gr italian dressing divided
• 3 gr parmesan cheese (grated)
• 1 gr salt
• 1 gr pepper
• 8 slices tomatoes (sliced)
• 8 slices onion rings (sliced)
• 8 slices green pepper (sliced)