Mix together cream cheese, butter and vanilla until smooth {I used a hand-held mixer}.  Stir in powdered sugar and brown sugar, mix until completely incorporated.  Stir in chocolate chips & sprinkles {if desired}.  Serve immediately with cookie or graham cracker.  Refrigerate for up to 3 days.  NOTE:  Sprinkles can bleed into dip when refrigerated, so be sure to add right before serving.