1/2 cup chocolate cookie crumbs
1 pinch ground cinnamon
8 (1 ounce) squares semisweet chocolate
1 tablespoon butter
2 (8 ounce) packages cream cheese, softened
1 cup heavy whipping cream
1 teaspoon vanilla extract
2/3 cup white sugar
2 eggs, beaten
1 1/2 tablespoons unsweetened cocoa powder
1 1/2 cups water
Grease an 8 inch springform pan that will fit inside the pressure cooker. Mix chocolate wafer crumbs and cinnamon together. Sprinkle on the bottom of springform pan, pressing gently.
Melt chocolate and butter together and set aside.
With a food processor or electric mixer, process cream cheese until smooth. Add chocolate mixture, and process until mixture is wellmixed and uniformly colored. Add 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. Cover entire pan with aluminum foil.
Add water to pressure cooker. Place pan on the trivet in pressure cooker. Seal cooker. Bring up to 15 pounds (high) pressure. Reduce heat to stabilize 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.
Remove cheesecake from pan, and refrigerate for 8 hours before serving.