Slow Cooker Caramelized Onions

Buttery, sweet, and and delicious, these slow cooker caramelized onions are super easy to make and delicious in so many recipes!

4 from 3 votes

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Course: Condiments

Cuisine: American

Prep Time: 5

Cook Time: 10

Total Time: 10 5

Servings: cups

Author: Jennifer Stewart

Slice the onions no more than 1 inch thick. Separate the slices and add to the crockpot bowl.
Add the butter and stir to coat.
Cook on low for 10 hours stirring occasionally. The last hour or two, crack the lid so the juices can evaporate to get the thick, jammy texture.
Remove and cool. Store how you like.

The raw onions release a lot of liquid and it needs to cook off. Crack the lid to allow for evaporation. This gives the onions a jam texture.
Check in on them every now and then and give a stir.
Add balsamic vinegar, Worcestershire sauce, brown sugar, or a spirit for extra flavor!
Freeze them in small portions (ice cube trays are great for this) to easily add to recipes.
If your slow cooker gets a little hot on the edges and the onions start to burn, use a spatula to scrape them off and into the center of the pot.