Directions

1. Grease an 8-inch springform pan that will fit inside the pressure cooker. Mix the chocolate wafer crumbs and cinnamon together. Sprinkle the crumb mixture on the bottom of springform pan, pressing gently to form the crust.
2. Melt chocolate and butter together and set aside.
3. With a food processor or electric mixer, process cream cheese until smooth. Add chocolate mixture, and process until mixture is well-mixed and uniformly colored. Pour in the cream, vanilla extract, sugar, and eggs. Beat well. Sieve cocoa powder over batter, and pulse or mix on low speed until cocoa is thoroughly incorporated. Pour mixture over crumbs in pan. Cover cake with a piece of waxed paper. Wrap the entire pan with aluminum foil.
4. Add water to pressure cooker. Place pan on the trivet in pressure cooker. Seal the cooker and bring it up to 15 pounds (high) pressure. Reduce the heat to maintain the pressure, and cook 45 to 50 minutes. Remove cooker from heat, and let the pressure drop on its own. Remove cheesecake from cooker, and let cool to room temperature in pan on a wire rack.
5. Remove cheesecake from pan, and refrigerate for 8 hours before serving.