To convert a traditional recipe for a slow cooker, adjust the cooking time as follows:
Recipe time Slow cooker (on low)
15 minutes 1.5-2 hours
20 min. 2-3 hrs.
30 min. 3-4 hrs.
45 min. 5-6 hrs.
1 hr. 6-8 hrs.
1.5 hrs. 8-9 hrs.
2 hrs. 9-10 hrs.
You'll probably need less liquid, as well.
Doubling a slow cooker recipe is a little more complicated than with a normal recipe. Only add half again as much liquid as in the original recipe (for instance, 1 cup of broth in the original slow cooker recipe should only become 1.5 cups when "doubled"). You'll also need to cook it about an hour longer; check it carefully for doneness and cook longer if needed.
On those cold winter days when your hair sticks to your face and the cat's ears give you little static shocks, an unlidded slow cooker full of water (and any dried herb you care to add, optional) makes a passable humidifier. (If the cat will let you touch his paw with one hand, making skin-to-skin contact, you can pet him with the other hand without snapping either of you. Try slipping your hand under the paw rather than holding it, most cats object to having a paw trapped.)
Much of this information came from: Slow cooking for two : basics techniques recipes / Cynthia Graubart. Gibbs Smith, c2013. ISBN: 9781423633839.
