Mix together butter, cream cheese and sugars until smooth.
Stir in chocolate chips by hand.
Chill until ready to serve or at least one hour.
Video
Notes
Make sure your cream cheese and butter are both softened so that they combine easily and smoothly. You don't want lumps. Cream cheese can sit at room temperature for two hours before using. Butter can sit at for an extended period.
I love to make this dip with mini semi sweet chocolate chips but you could also use toffee bits or a flavored chip such as mint.