Crockpot Caramelized Onions are golden perfection. With almost no effort, the slow cooker transforms simple onions into a silky, golden, deeply sweet tangle of flavor. They’re the kind of ingredient that instantly elevates everything, burgers, soups, dips, pastas, sandwiches. They cook low and slow while you go about your day.
These onions are a great addition to your game day table. I love to switch up onions by making them different ways such as my Simple Pickled Onions Recipe and Pressure Cooker Caramelized Onions. Give them a try.
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Why this Slow Cooker Caramelized Onion Recipe is a Keeper
Deeply caramelized onions in the crock pot are simple, customizable and super easy to scale up to freeze. Add onions to hot dogs, hamburgers or use as a base for soups like french onion soup.
- Hands-Off Cooking: Toss a bunch of onions in and let the slow cooker do all the work.
- Perfect for Batch Cooking: Make a large quantity at once.
- Deep, Sweet Flavor: Slow cooking naturally brings out the sugars.
- Freezer-Friendly: If you love caramelized onions, store portions for easy meals later. Divide into smaller portions for when you need them.
How Long do Crockpot Caramelized Onions Take?
Generally, making caramelized onions in the slow cooker takes around 8 hours on low. Caramelizing onions seems like it takes forever, but cooking low and slow is the key for the best cooked onions.
Pro Tip for Onions in a Slow Cooker
Slice onions evenly and avoid overcrowding beyond the recommended fill level. Too many onions can trap moisture and slow browning.
Ingredient Notes for Caramelize Onions in a Slow Cooker
The slow cooker method for onions uses only a few simple ingredients you probably already have, or can grab in one quick trip to the store. Cook for 10 hours without having to babysit them.
Get the full printable recipe with specific measurements and directions in the recipe card below.
- Onions: Use thinly sliced white onions or sweet yellow onions. You will need about 2 pounds. I use vidalia onions.
- All Purpose Seasoning: I like to make my own All Purpose Seasoning to have on hand whenever I need to add a pinch of flavor.
- Brown Sugar: Brown sugar will add that extra rich flavor
Variations and Substitutions to Make Caramelized Onions
Carmelized onions are super flexible. Switch it up to make it work for your tastes.
- Add Balsamic Vinegar: Stir in during final hour for depth.
- Onions: Sweet onions create a milder, sweeter flavor. You could also use red onions, but they won’t be as pretty.
- Add Fresh Thyme: Enhances savory notes with salt and pepper to make a new recipe.
- Make It Vegan: Use olive oil instead of butter.
Special Equipment Needed for this Onion Side Dishes
You don’t need anything fancy, but these tools make caramelized onions easy. You want nice uniform slices so definitely try to invest in a mandoline.
- Slow Cooker: A 6-quart size crock pot works well for batch cooking.
- Mandoline Slicer: Ensures even slices and cuts down a lot on prep time.
How to Make Slow-Cooker Caramelized Onions
Perfectly caramelized onions are done in 1 incredibly easy step. Slow cooker caramelized onions are so good, this method quickly became one of my favorites.
Get the full printable recipe with specific measurements and directions in the recipe card below.
- Slice the Onions: First, peel and thinly slice the onion.
- Cook the Onions: Add the thinly sliced onions, butter, brown sugar and All Purpose Seasoning to the pot of a slow cooker. Cover and cook on low for 8 to 10 hours, making sure to check on it to stir the onions every so often until they are a rich golden brown.
Prep Ahead for the Crockpot Caramelized Onions
When I prepare ingredients ahead of time, it can help save me time and kitchen space when it comes to making everything for dinner.
- Slice All of the Onions in Advance: Store sliced raw onions up to 2 days before cooking.
- Cook Overnight with Lid Ajar: Start before bed and let them cook and wake up to caramelized onions. Keep the lid slightly ajar.
- Portion for Freezing: Make a big batch of Crockpot Caramelized Onions and portion into ½ cup servings.
Alternate Cooking Methods for Caramelized Onions
Alternatively, you can make onions using your stove, Instant Pot or even the oven to make this sweet and savory topping.
- Stovetop: Cook in skillet for a cook time of 45–60 minutes, stirring occasionally.
- Instant Pot: Use pressure + sauté method.
- Oven: Bake covered at 400°F for about 1 hour, stirring occasionally.
Store, Reheat and Use Leftover – French Onion Soup
- Storing: Make a batch. Refrigerate in airtight container up to 5 days.
- Reheating: Warm in skillet on low heat or microwave.
- Using Leftovers: Add to burgers, sandwiches, omelets, pizza, mashed potatoes, or French onion soup. Also try topping for baked brie. Stuffed into grilled cheese with apple slices or mixed into hummus. You can layer in casseroles.
Common Questions About Easy Caramelized Onions
Watery onions can be due to overcrowding the pot. If you find that it’s super wet in the pot, vent the lid to let some of the moisture escape.
These onions will still get golden brown, but they may not be as dark as they might on the stove. But, they’re still great for things like soups and stews.
Tips for Making Caramelized Onions in a Crock Pot
- Slice Uniformly: Ensures even cooking.
- Finish Uncovered: Improves color and texture.
- Don’t Stir Too Often: This is one of the easiest ways to make caramelized onions. Just let slow heat work them naturally to deep golden brown.
- Cook Low for Best Flavor: Low setting produces deeper sweetness.
- Serve With: Serve in a Instant Pot French Onion Soup recipe, on top of the Best Baked Hamburgers or in Crock Pot Pierogi Casserole.
More Recipes You Might Like
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Crockpot Caramelized Onions
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Ingredients
- 2 pounds White onions, peeled and sliced thin
- 3 Tablespoons Butter
- 1 Tablespoon Brown sugar
- 1 teaspoon All Purpose Seasoning Blend
Instructions
- Add all ingredients to slow cooker and toss to combine.
- Cook on low for 8 hours.
- Check onions every few hours, if there is too much liquid in the slow cooker, vent the lid to allow some moisture to escape.
- Serve immediately.
Christina’s Notes
- Cook on High: For quicker slow cook caramelized onions, cook on high for 5-6 hours. Disclaimer, cooking on low will yield better results.
- Chopping Onions: To prevent eye irritation or crying when chopping up onion, keep a wet paper towel next to the cutting board, simple try but makes huge difference.
- Stove Top: If you don’t have a crockpot but still want to easily make caramelized onions in a pinch, try this recipe and technique to achieve similar results.
- Caramelized Onions for Burger: There is nothing better than a burger with caramelized onions, it is a classic that everyone loves and great way to use this recipe.
- Scale the recipe: Simply adjust the serving size in the recipe card and the ingredients will update automatically.
- Make your own All Purpose Seasoning: When a recipe calls for All Purpose Seasoning, you can use my homemade All Purpose Seasoning recipe or substitute salt and pepper to taste.
- Meat doneness: I always use a meat thermometer to test for doneness when cooking meat.
- Use unsalted butter: I use unsalted butter so I can control the salt level in the recipe.
- Preheat the oven: Unless otherwise noted, always preheat your oven before baking.
For more helpful information about this recipe, such as variations, substitutions and other pro-tips, check out the blog post.
came out as expected. I added a splash of wine.