Slow Cooker Caramelized Onions Recipe

A jar filled with rich, slow cooker caramelized onions rests invitingly on a rustic wooden board.

5 from 1 vote

Slow Cooker Caramelized Onions Recipe

Slow cooker caramelized onions are easy to do with just 10 minutes prep work beforehand. Best 3 ingredient side dish for burgers. Make sweeter with brown sugar or keep savory with just butter.

Prep Time15

Cook Time10

Course: Side Dish

Cuisine: American

Keyword: caramelized, crockpot, onions, slow cooker

Servings:

Author: Justine

Equipment

1 slow cooker
1 knife
1 cutting board

Ingredients

8 large onions sliced
1 tsp salt
1/4 cup butter melted

Instructions

Remove skins and slice onions thinly. Add to a slow cooker. Sprinkle onions with salt and drizzle with melted butter. Toss to coat onions. (if you want a touch of sweetness add 1 tbsp of brown sugar into mix too)
Cover and heat on low for 10 hours. If onions have too much liquid, or you want them browner, continue to cook another 2-4 hours on low until liquid is reduced. Remove with slotted spoon from slow cooker and use in your favorite recipes. Makes 2-1/3 to 3 cups of cooked onions

Video

Notes

Slow cooker caramelized onions on high

I always recommend low but if you wanted to speed it up a bit you could first set to high for the first 2 hours. Then reduce the heat to low for 5 hours or until tender to your liking.

On high the whole time won't yield you the deep flavor you want and would expect but this option is a good go between for less cook time.

Nutrition