In small bowl combine the raisins and rum. Let stand for about 15 minutes for the raisins to absorb the rum.
Preheat oven 350 degrees F.
In the bowl of a stand mixer with the paddle attachment, combine brownie mix, rum raisins (do not drain the rum), walnuts, vanilla extract, water, eggs, ½ cup chocolate chips. Stir to combine until a thick batter comes together.
Pour the batter into an 8x8 square lined baking dish. Bake for about 30 minutes or until the cake tester comes out clean. Remove and let cool completely.
Break up the brownies into a large bowl and combine with the vanilla frosting until incorporated. Using a tablespoon or ice cream scooper, scoop out the batter onto a line baking sheet. Freeze for about 10 minutes.
In the meantime, melt down 1 cup of chocolate chips in a double-boiler or microwave. Carefully dip each bonbon into the melted chocolate. I use two forks to this process to let the excess drip. Place back onto the baking sheet and refrigerate until the chocolate has set.
Before serving, dust with cocoa powder. Enjoy!
Notes
Bonbons can be stored into an airtight container for upto a week.