In the bowl of a stand mixer, cream the butter and cream cheese together until you have a smooth consistency.

Add in the cocoa and mix until combined.

Incorporate the flour, salt and brown sugar until smooth. (may be a little lumpy but will smoot out once other ingredients are added)

Add the milk and vanilla.

Then add the confectioners sugar one cup at a time.

Whip the dip until it is all blended, smooth and creamy.

Pour into your serving bowl and garnish with chocolate chips if desired.