Cut fabric 1 inch larger than desired size. For example, if you want to make a 14-inch square Snuggle, cut fabric 15" x 15".
With fabric right sides together, sew a double hem on three sides. Turn with right side out. Stuff with desired filling, e.g. fiberfill, terry cloth, etc.
Sew last side with a zipzag or double stitch.
Sew across the entire Snuggles to hold filling in place.