Preheat oven to 350 degrees (or temp on box) and make the box cake mix according to the directions. Spread mixture onto a sheet pan and bake for 25-30 minutes, until edges are lightly golden.

Once the cake is cooled completely, take a small round cutter and a slightly larger round cutter and cut out pieces (just check your jar to make sure the pieces will fit into it - the one on bottom will be smaller than the top piece.) You'll need two pieces per jar - so 12 large and 12 small pieces. Put on another baking sheet and put them back in the oven for 12-15 minutes until somewhat dried out, the tops will be golden brown. Remove and completely cool.

With an electric or stand mixer, mix together the mascarpone, confectioners sugar, and vanilla until completely combined.

In a separate small bowl, mix together the brewed coffee and Kahlua.  Starting with the small cake round, dip the cake into the coffee mixture, going just barely to the top of the round, then put it in the bottom of the jar. Spoon in some of the mascarpone mixture, then dip the larger round in coffee mixture, put it on top, top it with another layer of mascarpone mixture, then grate the chocolate on top.