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+ servings

Slow Cooker Caramelized Onions

Need caramelized onions? Let your slow cooker do all the work!
Prep Time10 minutes
Cook Time10 hours
Total Time10 hours 10 minutes
Course: condiments, Tips/Tricks/Methods, vegetarian dishes
Cuisine: American
Keyword: carmelized onions, slow cooker recipes
Servings: 1 cup
Calories: 508kcal


  • 3-5 very large onions baseball sized, sliced (see photo and description in post)
  • 3 tbsp olive oil -OR- melted unsalted butter
  • 1/2 tsp kosher salt
  • 1/4 tsp sugar
  • pinch of white pepper
  • 1 small sprig fresh thyme optional


  • Mix sliced onions with all the ingredients in a large bowl--mix up well so the onions are coated with the oil/melted butter.
  • Place in a 4-6 quart slow cooker (see NOTES)
  • Cook on low 10 hours, stirring every so often if desired.
  • For deeper color, cook an additional 2-3 hours on low with the lid ajar.


Choose the correct size cooker--the cooker must be at least 1/2 full with raw onions. If you use too large a cooker, the onions (like anything else) will burn and overcook. If you only have a large-size crock pot, double or triple the recipe. THESE FREEZE WELL so if you have to make a lot, you'll always have on hand.


Serving: 1serving | Calories: 508kcal | Carbohydrates: 32g | Protein: 4g | Fat: 42g | Saturated Fat: 6g | Sodium: 1177mg | Potassium: 482mg | Fiber: 6g | Sugar: 15g | Vitamin C: 26mg | Calcium: 76mg | Iron: 1mg