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Slow cooked caramelized onions on a spoon with more onions in the background
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4.50 from 2 votes

Slow Cooker Caramelized Onions

Slow cooker caramelized onions are a delicious and easy treat. The sweet and savory flavor of deep, slowly cooked onions will add next-level flavor to any dish you add it to.
Prep Time15 minutes
Cook Time12 hours
Course: condiment, Side Dish
Cuisine: American
Keyword: caramelzed onions, crockpot onions, slow cooker caramelized onions
Servings: 10 servings
Calories: 92kcal



  • non-stick spray of choice
  • 3 lbs onions sliced
  • 3 tablespoon olive oil


  • slice onions
  • spray slow cooker with non-stick spray
  • add onions to slow cooker and drizzle with olive oil
  • cover and cook on low for 10 hours
  • move lid so that slow cooker has several open inches at the top. This will allow extra liquid to evaporate and give your onions a nice, thick consistency.


If you prefer, you can drain the onion liquid into a separate bowl rather than allowing it to evaporate.  This liquid can be used in soups or other slow cooker recipes.  


Calories: 92kcal | Carbohydrates: 13g | Protein: 1g | Fat: 4g | Saturated Fat: 1g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 3g | Sodium: 6mg | Potassium: 199mg | Fiber: 2g | Sugar: 6g | Vitamin A: 3IU | Vitamin C: 10mg | Calcium: 31mg | Iron: 1mg