Brownie Batter Dip

In a large bowl with a handheld electric mixer or in the bowl of an electric stand mixer, whip together the cream cheese and butter until light and fluffy, 1-2 minutes. Add the powdered sugar. Mix well. Add the flour, cocoa powder, brown sugar, vanilla and milk. Mix until fluffy and smooth. Add additional powdered sugar and/or milk, if needed, until desired consistency is reached. The dip should be soft enough to easily dip a pretzel in (without breaking the pretzel!) but not so soft that it spreads out instead of holding its shape in a fluffy cloud of brownie batter goodness. Garnish with chocolate chips, if desired.