Bake biscuits according to package directions. (Sam's brand directions are to bake at 400 degrees for 8-10 minutes).
Meanwhile, melt the butter in a microwave safe bowl for 30-40 seconds. Mix the cinnamon and sugar together in a separate shallow bowl.
As soon as the biscuits come out of the oven, roll them in the butter, and then immediately in the cinnamon sugar. (You may need to use tongs, or I guess you could let them cool slightly).
Enjoy them warm.
I seldom make these, so I like to take the leftover cinnamon sugar and mix it into the remaining butter to spread on toast. It is hard to roll the biscuits if you use any less, but I suppose you could cut it down to 1/4 cup each of the sugar and margarine if you'd rather not have any left over.