Ghirardelli Bittersweet Chocolate Cheesecake

• 350 until set
• 13 springform (pan)
• 5 eggs
• 1 pkg oreos
• 1 if unavailable use cocoa
• 1,000 gr ghirardelli bittersweet
• 1,200 ml cream cheese
• 575 ml sour cream
• 500 gr sugar
• 55 gr butter