Preheat oven according to brownie package instructions (mine was 350°F.)
Mix brownie batter ingredients as directed. Stir in espresso powder and Kahlúa and mix well to combine. Pour batter into a well greased or parchment lined 9x13 baking pan.
In a medium bowl, using a hand mixer or standing mixer, mix cream cheese, sugar, egg and vanilla until smooth. (about 2-3 minutes)
Spoon dollops of the cream cheese mixture into the brownie batter and using a toothpick or a knife, swirl it into the brownie mix.
Place in oven and bake according to package directions. Remove from oven and cool for 15 minutes before enjoying!