I used a pattern that is free on Ravelry - Fully Fashioned Machine Knit Mittens.
My quick assessment is that this is a pretty good pattern, but if (when) I make these again I will do it circularly. It was a royal pain to have to seam these - up the thumb and side of the mitten hand, then from the wrist edge to the lower edge of the thumb. And grafting the finger end.
|Conjoined twin mitten!
I used black sock yarn (only 35g) for the outer mitten and a tiny bit of the pink/red which in turn was leftover from my very first socks. The lining is Woolike, a 100% acrylic yarn from Michaels. It's nice and soft. The finished mittens are thick and feel substantial. They would not block wind but will be good for some conditions, including when I'm skiing and my hands are really warm from my serious mittens but it's too cold to simply remove all hand covering.
I wonder what I'll do next?