Preheat oven to 325 degrees

Line 8 x 8 pan with parchment paper

Place cream, melted butter, egg yolks, espresso powder, Vanilla extract , salt in medium bowl and stir until fully mixed. Add brownie mix and chocolate chips until well blended.

Spread into prepared pan and bake at 325 degrees for approximately 42 minutes(often more). Remove from oven when center is set and edges have begun to pull away from sides.

Cool completely in pan. Remove to cutting board and cut. Serve!