Preheat oven to 350°F. Spray an 8” square pan with cooking spray.
In a bowl, combine crust ingredients; mix until crumbs are evenly moist. Press into bottom of prepared pan.
Bake for 8 minutes or until firm.
To make the filling:
In a bowl using an electric mixer, beat cream cheese on medium speed until smooth.
Add Splenda Sweetener, espresso granules, and cocoa powder; beat on medium speed until blended.
Add eggs, one at a time, beating well after each addition. Add sour cream and vanilla extract and mix to blend, then mix in chocolate chunks. Pour filling over prepared crust.
Bake for 30–35 minutes, or until set; cool. Refrigerate until firm before cutting into bars.