Roasted Chicken Breasts With Cranberry Port Sauce

• 12 chicken breasts
• 3 zucchini
• 1 onion
• 1/2 cranberries
• 1/2 port
• 3/8 filling under skin
• 475 ml chicken stock
• 240 ml wine (red)
• 160 gr mushrooms
• 120 ml whipping cream