Preheat oven to 350.
Mix together the cake mix, oil, coffee, 1 egg, and half of the chocolate chips.
Spread into greased baking pan.
Beat together cream cheese, sugar, 1 egg, and vanilla.
Spread onto the top of the brownie batter. Cutting through for a marbled effect.
Spread the remaining chocolate chips on top.
Bake for 40 minutes