Slow Cooker Caramelized Onions


Let your slow cooker do all the work of making beautifully caramelized onions. Freeze what you don't use right away so you'll have caramelized onions ready in a snap for soups, burgers, omelets, pizzas, and more.

Prep Time:
10 mins
Cook Time:
10 hrs
Total Time:
10 hrs 10 mins
1 quart


  • ¼ cup melted butter, divided

  • 8 onions, thinly sliced

  • 1 teaspoon salt


  1. Rub bottom and sides of slow cooker with 1/2 of the butter. Toss onions and salt with remaining butter in a bowl.

  2. Cook onions on Low until browned and sweet, about 10 hours.

Cook's Notes:

Substitute butter with olive oil, if desired.

After 10 hours of cooking, reserved liquid can be strained and used to make soup or sauce.

Onions can be cooked longer for a deeper brown and more concentrated flavor, if desired. To reduce further, leave the liquid in and cook, stirring occasionally, until the onions are darker brown and the liquid is almost completely cooked off, 4 to 5 hours.

Nutrition Facts (per serving)

71 Calories
3g Fat
11g Carbs
1g Protein
Nutrition Facts
Servings Per Recipe 16
Calories 71
% Daily Value *
Total Fat 3g 4%
Saturated Fat 2g 10%
Cholesterol 8mg 3%
Sodium 170mg 7%
Total Carbohydrate 11g 4%
Dietary Fiber 2g 7%
Total Sugars 5g
Protein 1g
Vitamin C 8mg 42%
Calcium 27mg 2%
Iron 0mg 1%
Potassium 167mg 4%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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