I made these mittens with chunky worst weight yarn and a size I hook. Keep in mind that I am doing this from memory, I unfortunately did not take any notes.
Starting at cuff: chain 11
Row 1: sc in second chain from hook, sc in the remaining stitches, ch1 turn (10 sc)
Row 2: sc in back loops of each sc across, ch1, turn
Repeat row 2 until 20 rows are completed.
Turn work to the side and work in continuous rounds.
Row 1: work 20 sc along side of the cuff mark the first and the last stitch
Row 2: 2 sc in the first stitch, sc until the last stitch, 2 sc in the last stitch (22 sc) again, mark the first and the last stitch.
repeat row 2 until you have 30 sc.
Setting up for the thumb:
sc in the next 4 sc, sc in the next sc and mark this stitch. sc in the next 21 sc, skip the next 8 sc, sc in the marked sc. (22 sc)
Marked stitch is first sc in each row.
Row 1: sc in each of the 22 sc around.
repeat row 1 for 10 rows, or about 1 1/2 inches below desired length.
Decrease for top of mitten:
Row 1: sc 2tog, sc in the next 4, sc 2tog, *sc in the next 5, sc 2 tog* repeat around
Row 2: sc around
Row 3: *sc in next 4, sc 2 tog* around
Row 4: sc around
Row 5: *sc in the next 3, sc 2 tog* around
Row 6: *sc in the next 2, sc 2 tog* around finish off.
sc in the first unworked sc (mark this stitch) and in the remaining 7 sc, 2 sc in the side of the mitten (10 sc)
do two more rounds of sc
decrease for thumb:
Row 1: sc in the next 3 sc, sc 2tog, repeat one more time
Row 2: sc around
Row 3: sc in the next 2 sc, sc 2 tog, repeat one more time, finish off.
Sew in ends, and sew up side seam for cuff.
Of course, make the other mitten.