Slow Cooker Caramelized Onions

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Wow. Slow cooker caramelized onions were so much better than I ever thought they could be. They were incredibly tasty. And perfect on grilled cheese sandwiches. And on burgers, in French onion dip or soup. Any recipe that calls for onions needs caramelized onions.

Slow Cooker Caramelized Onions

You might get thrown out of a fancy (or actually, even a not-so-fancy) restaurant kitchen if you suggested making slow cooker caramelized onions. But you won’t get thrown out of my kitchen. I’d make these again in a heartbeat. My favorite onions to use are Vidalia onions, but unfortunately they aren’t available for very long each year.

Try my blue cheese burgers with caramelized onions.

Slow Cooker Caramelized Onions
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4 from 1 vote

Slow Cooker Caramelized Onions

This recipe is sized for a 4-6 quart slow cooker. You want to use enough onions to fill the cooker at least halfway.
Course Side
Cuisine American
Keyword crockpot, onion, slow cooker
Prep Time 10 minutes
Cook Time 10 hours
Total Time 10 hours 10 minutes
Servings 2
Calories 284kcal
Author Mike




  • Add onions to slow cooker set on Low.
  • Drizzle with the oil and sprinkle with salt and thyme, if using.
  • Stir and cover and cook 10 hours, stirring occasionally.
  • If you desire a darker, richer color, remove the lid from the cooker cook another hour or two stirring often.
  • Keep in the fridge for up to a week.


Calories: 284kcal | Carbohydrates: 63g | Protein: 7g | Fat: 3g | Saturated Fat: 1g | Sodium: 835mg | Potassium: 994mg | Fiber: 8g | Sugar: 42g | Vitamin A: 74IU | Vitamin C: 40mg | Calcium: 182mg | Iron: 3mg

Nutritional values are approximate.

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