Preheat the oven to 350*.
In a medium bowl, mix together cinnamon and sugar.
Take the prepared biscuit dough out of the package and cut each biscuit into six smaller pieces.
Once cut, toss gently in the cinnamon sugar mix until completely coated.
Press the pieces of the cinnamon sugar coated dough into a greased muffin tin -- be careful to not overfill as the biscuits will rise significantly.
Next, add the melted butter to the remaining cinnamon sugar mixture and stir to combine well. Once mixed, spoon 2-3 tablespoons of the mixture onto each muffin.
Bake the muffins for 20 minutes or until they are cooked through.
For the icing, mix together the sugar and milk and when the muffins are finished, drizzle the icing over the cooled muffins.