PATTERN EDIT FOR RIGHT MITTEN ONLY!
When making the right mitten you will not turn your work on round 22

Round 17: Cut yarn and reattach yarn to 9th St away from the left side of the end of the round
Then Chain 10, this will be the thumb hole. Attach the 10 chains to 4th St away from the
end of the round. SC in every all 10 chains and every St.

If you want to make the pattern bigger then all you need to do is add more chains at the begging of the project.