I have been searching for awhile for double knit mitten pattern and found many patterns out there, but they all incorporated having to make 4 mittens, joining and inserting one mitten inside of the other. This was not want I wanted to do and thought 'there has to be a better way'. I figured out how to do it and wrote up the pattern to share with other's.
The mitts are knit up as one, turns into 2 mittens (one inside the other), reversible and toasty warm.
Here is the picture and pattern: reversible double mittens for the whole family