Crust Directions: preheat oven to 350 degrees F. Spray an 8-inch x 8-inch square baking pan with vegetable cooking spray. Set aside.
Combine chocolate wafer crumbs, Splenda Granulated Sweetener and butter in a mixing bowl, stirring until blended. Press mixture into prepared pan. Bake 5 minutes. Cool on a wire rack.
Filling Directions: beat cream cheese at medium speed with an electric mixer until smooth.
Combine Splenda Granulated Sweetener, espresso granules, and cocoa powder; add to cream cheese, beating until blended. Add eggs, one at a time, beating well after each addition. Add sour cream and vanilla, beating, just until blended. Stir in chocolate chunks. Pour filling over prepared crust.
Bake 30 to 35 minutes, or until firm; cool. Chill until firm. Cut into bars.