Preheat the oven to 350F. Grease an 8” square pan and line with parchment paper so that 1” wings hang over on two or four sides. If you have small metal clips, these will work great to secure the paper to the walls of the pan.
Use a tea strainer to sprinkle 3 tbsp of the powdered sugar. Let cool completely in the pan and then sprinkle the remaining sugar and any extra sugar needed over everything, covering any spots that may have melted into the butter. You can chill this in the fridge to make slicing easier.
In replace of rum, you can warm up coffee or orange juice and soak the dried fruit in this instead.
Here is the link for the recipe that inspired my version.