CrockPot Caramelized Onions Recipe
Introduction
CrockPot caramelized onions are a simple, hands-off way to bring out deep, sweet flavors in everyday onions. Perfectly tender and golden, these onions add richness to sandwiches, burgers, pizzas, or stews without any constant stirring.

Ingredients
- 4 lbs sweet yellow onions, peeled and thinly sliced into rings
- 6 tablespoons unsalted butter, sliced into pats
- 1 tablespoon brown sugar
- ½ teaspoon kosher salt
- ¼ teaspoon ground black pepper
Instructions
- Step 1: Add the sliced onions to the bottom of a 5 quart or larger slow cooker.
- Step 2: Add the butter, brown sugar, salt, and pepper, then toss everything gently to coat the onions evenly.
- Step 3: Cover and cook on low for 8 to 10 hours, stirring occasionally throughout to ensure even caramelization. The onions should become soft and deeply browned.
- Step 4: Adjust seasoning with additional salt and pepper if needed. Serve immediately or keep warm until ready to use.
Tips & Variations
- For a richer flavor, try finishing the onions with a splash of balsamic vinegar or a pinch of thyme before serving.
- Using sweet yellow onions yields the best natural sweetness, but you can experiment with red onions for a slightly different taste.
- Make sure your slow cooker is large enough to prevent overcrowding, which helps the onions caramelize evenly.
Storage
Store leftover caramelized onions in an airtight container in the refrigerator for up to 5 days. Reheat gently on the stovetop or in the microwave to preserve their soft texture and flavor.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I caramelize onions in a CrockPot overnight?
Yes, cooking on low for 8 to 10 hours works perfectly and allows the onions to develop a deep, sweet flavor without any extra effort.
Can I freeze caramelized onions for later use?
Absolutely. Let the onions cool completely, then freeze in airtight containers or freezer bags for up to 3 months. Thaw overnight in the refrigerator before reheating.
PrintCrockPot Caramelized Onions Recipe
This CrockPot Caramelized Onions recipe offers a hands-off, slow-cooked method to achieve deeply sweet, tender onions with a luscious caramelized flavor. Using a slow cooker, the onions gradually transform, perfect for adding rich depth to sandwiches, burgers, soups, or as a savory side dish.
- Prep Time: 15 minutes
- Cook Time: 8 to 10 hours
- Total Time: 8 hours 15 minutes to 10 hours 15 minutes
- Yield: Approximately 6 cups caramelized onions 1x
- Category: Side Dish
- Method: Slow Cooking
- Cuisine: American
Ingredients
Ingredients
- 4 lbs sweet yellow onions, peeled and thinly sliced into rings
- 6 tablespoons unsalted butter, sliced into pats
- 1 tablespoon brown sugar
- ½ teaspoon kosher salt
- ¼ teaspoon ground black pepper
Instructions
- Prepare Onions: Peel and thinly slice 4 pounds of sweet yellow onions into rings. This ensures they cook evenly and caramelize properly in the slow cooker.
- Combine Ingredients: Place the sliced onions at the bottom of a 5-quart or larger slow cooker. Add 6 tablespoons of unsalted butter, 1 tablespoon brown sugar, ½ teaspoon kosher salt, and ¼ teaspoon ground black pepper. Toss everything gently to coat the onions evenly with the butter and seasonings.
- Slow Cook: Cover the slow cooker and set it to low. Let the onions cook for 8 to 10 hours, stirring occasionally every couple of hours to promote even caramelization and prevent sticking. The onions should become very soft and richly caramelized by the end.
- Adjust and Serve: Taste and adjust seasoning with more salt and pepper if needed. Serve the caramelized onions immediately as a flavorful addition to dishes or keep them on the warm setting of the slow cooker until ready to use.
Notes
- Use sweet yellow onions for the best natural sweetness and caramelization.
- Stirring occasionally helps the onions cook evenly and prevents burning.
- Butter adds richness, but you can substitute with olive oil for a dairy-free option.
- These caramelized onions can be refrigerated for up to a week or frozen for longer storage.
- Adjust the sugar amount slightly if you prefer a sweeter or less sweet result.
Keywords: caramelized onions, slow cooker onions, crockpot onions, sweet onions, easy slow cooker recipe, side dish

