Make a slip knot
Chain 2
Work 6 single crochets into the second chain from the hook
Join with a slip stitch to the first single crochet
Chain 1
Work 2 single crochets in each stitch around
Join with a slip stitch
Chain 1
Work 1 single crochet in the first stitch, then 2 single crochets in the next stitch
Repeat around
Join with a slip stitch
Chain 1
Work 1 single crochet in each of the next 2 stitches, then 2 single crochets in the next stitch
Repeat around
Join with a slip stitch
Keep increasing by one more single crochet between increases in each round
Stop when the circle is the size you want
Weave in the yarn tail