Easiest caramelized onions you'll ever make! And easily adaptable to whatever size slow cooker you have and how many onions you have on hand.
What you need:
3-5lbs yellow onions
1/2-1 stick butter
What you do:
Peel your onions, and slice into half moon shapes. You could probably leave them as full rings if you wanted to, but I found the half rings easier to manage.
Dump your sliced onions into the crock pot, and pack them in. I have a 6qt slow cooker, I had just over 4lbs of onions, and I could have easily fit 3-4 more onions on, but I was all out.
Put your stick of butter on top of the onions. For my 4lbs, I used 3/4 stick; use more if you want to, or cut it down to half a stick if you're using less or all that butter makes you squeamish.
Set your crock pot to low, and leave the lid slightly ajar. After 3-4 hours, give the onions a good stir, put the lid on tight, and allow to cook for another 8-9 hours.
Pack onions into mason jars; these will last in your fridge for darn near forever if you don't eat them all first! My 4-ish lbs gave me just under 1.5 quarts caramelized onions, loosely packed.
I can't wait to make a grilled cheese sandwich and add a layer of these caramelized onions in the middle!