1.  Preheat oven to 375 degrees and lightly grease 9 muffin tins.  In a bowl, mix together the sugar and cinnamon.  Open the biscuits and separate them.  Using scissors, cut each biscuit into 4 equal pieces.  Dip each piece into the butter, then roll them in the cinnamon sugar.
2.  You will need 9 of the cut biscuit pieces for each muffin.  Put four on the bottom of the tin, and then five as the top layer of the muffin.  Repeat with all the muffins.  Bake for 18 minutes and while they bake, mix together the powdered sugar and milk to form a thick glaze.  Once the muffins are done baking, allow them to cool in the pan for 3 minutes before drizzling on the glaze.  Remove carefully from the pan by using a knife to go around the edges and serve immediately.