fill crockpot with milk (i use 'whole' milk -3.25%)
turn to low.
2 1/2 hours later turn off crock
about 3 hours later, scoop out a cup or so of the warmish milk.
wisk in 1/2 cup of yogurt - natural with active culture - (i just buy walmart brand non fat plain yogurt - one small serving 6oz or 8oz - don't remember which it is) and dump in entire serving
then return the yogurt/warmish milk mixture to crock. put lid back on crock.
keep crock unplugged. wrap in warm towels, etc for 8 hours. (I put my crock in the travel crock bags and put it in the oven overnight - (gas) oven OFF!)
yogurt will be thinner than you're used to from storebought. if you want real thick (greek style) yogurt, simply take your pasta colander and line it with coffee filters. put the yogurt in that to drain off some of the liquid. it'll be real thick in a couple hours.
i like it both ways, thinnish and real thick. yum, yum!!
we use it up in a few days so i'm not sure of shelf life in fridge for it. to make a new batch of yogurt, just save about 1/2 cup of this yogurt as your starter. :)
add whatever toppings/sweeteners you desire. me i like plain yogurt. *grin*