Add the butter and brown sugar to the slow cooker and top with the sliced onions.
Cook on low for 10 hours.
If too much liquid is in the slow cooker cook with the lid turned to the side to allow venting for an hour (if you catch it before it is done cooking for 10 hours go ahead and let it vent for the last couple of hours.
Slow Cooker Caramelized Onions
Amount Per Serving
Calories 59Calories from Fat 27
% Daily Value*
Saturated Fat 2g13%
Vitamin A 115IU2%
Vitamin C 4mg5%
* Percent Daily Values are based on a 2000 calorie diet.