Eating Well's Chocolate Cheesecake

• 72 b -filling
• 2 egg whites
• 1 egg
• 300 gr sugar
• 240 ml low-fat sour cream
• 230 ml low fat cream cheese
• 65 gr unsweetened cocoa powder
• 55 gr semisweet chocolate
• 30 gr instant coffee powder
• 16 gr cornstarch