Heat oven to 350 degrees F. If using a dark or non-stick pan, reduce heat to 325 degrees F.
Cover the bottom of a 9 inch square pan with parchment paper. A pan with a loose or removable bottom is recommended.
In a small bowl, beat cream cheese, egg, sugar, vanilla and vanilla bean together until smooth and creamy. Fold in mini chocolate chips. Set aside.
Prepare brownies according to package directions. Stir in one cup of chocolate chips.
Pour 3/4 of the brownie batter into the bottom of prepared pan. If desired, drizzle hot fudge sauce over brownie batter. Carefully spoon or pour cream cheese mixture on top of hot fudge and brownie batter. Don't worry if you don't cover the entire surface. Spoon remaining brownie batter onto cream cheese layer. With a knife, gently run the knife through the mixtures to create the marble effect. If desired sprinkle with additional chocolate chips.
Bake for 45-50 minutes. Remove from oven and allow to cool completely, at least two hours.
Cut into sixteen brownies.
Store any remaining brownies in the fridge. Enjoy!