Break the biscuits down into crumbs, you can leave a few chunks in there, but nothing bigger than about the size of a quarter.
Add the brown sugar and cinnamon and mix.
Combine the eggs, vanilla and milk in another bowl. Add to dry ingredients and stir until completely mixed. This will make a thick batter, but if don't want your bread pudding to be as dense as the stuff at KFC, add a little more milk.
Press the batter into a greased 8x8 pan and bake at 350°F for 15-18 minutes.
Let cool slightly.
For icing, heat the butter and milk together until the butter is melted. Add enough powdered sugar until you have a thin consistency to drizzle over the bread pudding.