Crush the candy bars and mix with the brown sugar.
With an electric mixer beat together the softened cream cheese, sour cream, and sugar until smooth and creamy.
Add in approximately 3/4 of the Butterfinger/brown sugar mixture and stir to combine.
Add grapes that have been plucked from their stems and rinsed and stir until all of the grapes are well coated
Fill your dish with the grapes and top with remaining 1/4 of the Butterfinger/brown sugar mix.
You can eat this right away, but it’s best if it is made a day ahead and chills in the fridge over night.