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 the cuff: chain 11
Row 1: sc in the 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 alongside 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 the 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 the side seam for the cuff.
Of course, make the other mitten.
Here is the video for the mittens: