I have a stack of these booklets that I found at a thrift store. They feature lots of projects using various needlecrafts, and almost always have a crochet feature. I thought there would surely be a potholder pattern, and I wasn't disappointed! This is the pattern:
Here are mine!
I used Elann Sonata yarn. Original size was 9.5 inches across, but then I washed them and they shrunk to about 8 inches. They are pretty squishy!