Filet Farcis A La Creme

• 6 sole fillets
• 2 onions (chopped)
• 2 cans tiny shrimp
• 325 gr crabmeat
• 240 ml cream (light)
• 120 ml dry wine (white)
• 80 gr mushrooms (sliced)
• 60 gr swiss cheese (grated)
• 28 gr butter
• 30 ml cognac (optional)