French onion soup feels fancy, but it doesn’t need to mean standing over the stove all day. This Crockpot French Onion Soup Recipe gives you deeply caramelized onions, rich beef broth, and melted cheese over toasted bread.
The crockpot does the onion work for you—no babysitting a soup pot. It works in any size crockpot, from a 2-quart mini to a full-size slow cooker, and honestly, it beats most restaurant versions.
⏰ Quick Answer: How Long to Cook French Onion Soup in a Crockpot
- Cook the onions: 9–10 hours on high or 10–11 hours on low, until soft and deeply caramelized.
- Finish the soup: Add the beef broth and cook for 1 more hour.
Go by the onions, not just the clock—they should be deeply golden brown before adding the broth.
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- 📝 TL;DR — Recipe Summary
- 🧅 Ingredients
- 👨🍳 Quick Overview: How to Make French Onion Soup in a Crockpot
- ⏱️ How Long to Cook Onions in a Crockpot
- 👨🍳 Options and Variations
- ↕️ Changing the Recipe Size and Crockpot Size
- 📋 Crockpot Soup Recipes
- 🍽️ How to serve French onion soup
- ❄️ Storage & Reheating
- ❓ FAQs
- 📖The Recipe Card
Featured Comment by Judith:
⭐⭐⭐⭐⭐
"Will definitely be making again! It tastes just like the French onion soup from our favorite restaurant!! Thanks for a great recipe!"
📝 TL;DR — Recipe Summary
What: Classic French onion soup with caramelized onions, beef broth, toasted bread, and melted cheese.
Why: The crockpot caramelizes the onions without standing over the stove all day.
How: Cook the onions with butter and seasoning until deeply golden, add the broth for the final hour, then top with toasted bread and cheese and broil.
🧅 Ingredients
- Onions — Yellow or white onions work best. Sweet onions like Vidalia, Maui, or Walla Walla can also be used.
- Beef broth or stock — Use a good-quality broth or stock since it provides most of the soup's liquid and flavor.
- Butter — Salted or unsalted.
- Seasoning — Thyme, salt, and black pepper.
- Worcestershire sauce — Adds savory depth to the broth.
- Bread and cheese — Toasted crusty bread topped with provolone, Gruyère, or Swiss cheese gives French onion soup its classic finish.
👨🍳 Quick Overview: How to Make French Onion Soup in a Crockpot
Prep the onions: Chop the onions into petals or rings and separate them.
Caramelize: Add the onions, butter, thyme, salt, pepper, and Worcestershire to the crockpot. Cook until the onions are soft and deeply golden brown—about 9–10 hours on high or 10–11 hours on low. Go by color, not just time.
✅ Pro Tip: Always check a few hours early and give it a stir while you are there.
Add the broth: Add the beef broth and cook for 1 more hour to blend the flavors. For a 2-quart crockpot, add half the broth first and the rest near the end.
Finish and serve: Ladle into oven-safe bowls, top with toasted crusty bread and provolone, Gruyère, or Swiss cheese, then broil until bubbly and golden, about 2–4 minutes.
👇 Scroll for the printable recipe card and complete photo instructions—or keep reading for tips, variations, and serving ideas.
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⏱️ How Long to Cook Onions in a Crockpot
The onions are ready when they are soft and deeply caramelized to a golden brown. Cooking time varies between crockpots, so go by color, not just the clock.
Plan on about 9–10 hours on high or 10–11 hours on low, but check a few hours early to prevent overcooking. Once the onions are ready, add the beef broth and cook for 1 more hour to blend the flavors.
👨🍳 Options and Variations
- Garlic: Add a clove or two with the onions if you want a little garlic flavor.
- Wine: Add dry sherry, dry white wine, or red wine with the broth for additional flavor.
↕️ Changing the Recipe Size and Crockpot Size
This recipe makes about 7 cups or 4 servings and is best suited to a 3–4 quart crockpot.
- Half recipe: About 2 servings; use a 2-quart mini crockpot.
- Full recipe: About 4 servings; a 3–4 quart crockpot is the best fit.
- Double recipe: Use a full-size 6-quart or larger crockpot.
For a full recipe in a 2-quart crockpot: It will be very full. After caramelizing the onions, add half the broth, then add the remaining broth near the end.
✅ Use the serving adjustment feature in the recipe card to adjust the ingredient amounts. Use the amounts in the ingredients list, not the instructions.
📋 Crockpot Soup Recipes
🍽️ How to serve French onion soup
Serve French onion soup as a main dish, appetizer, or side. Ladle into oven-safe bowls, top with toasted French or other crusty bread, then add provolone, Gruyère, or Swiss cheese and broil until browned and bubbly.
Slices of cheese are easiest for covering the bread, but shredded cheese also works. Large croutons can replace the toasted bread.
If serving it as a main dish, a simple salad and bread are plenty.
❄️ Storage & Reheating
- Refrigerate: Store leftover soup without the bread or cheese in an airtight container for up to 4 days.
- Freeze: Freeze in meal-size portions for up to 3 months. Thaw overnight in the refrigerator.
- Reheat: Warm on the stovetop or in the microwave, then add fresh toasted bread and cheese and broil until melted and bubbly.
❓ FAQs
Yes. A half recipe fits easily. For a full recipe, caramelize the onions first, add half the broth, then add the remaining broth near the end to prevent overflowing.
No. Wine is optional in this crockpot recipe. For additional flavor, add a little dry sherry, dry white wine, or red wine with the broth.
Caramelization is the slow browning of the natural sugars in onions, producing a deep golden color and richer flavor.
For this recipe, the onions should be soft and deeply golden before you add the broth. The deeper the color without burning, the better the flavor.
📖The Recipe Card
Crockpot French Onion Soup Recipe
Video Slideshow
Ingredients
- 1½ pounds onions—white or yellow - (about 3 medium onions)
- 1 teaspoon coarse salt
- 2 tablespoons butter
- ½ teaspoon pepper
- 1½ teaspoons Worcestershire sauce
- ½ teaspoon thyme
- 4 cups beef broth
- ¼ cup wine-optional
- Crusty bread
- Provolone, Gruyère, or Swiss cheese
Step-by-Step Instructions
- Prep onions: Slice 1½ pounds of onions into petals or rings and separate into individual pieces (about 5–6 cups raw). Add to a 2-quart or larger crock pot.
- Season: Add 1 teaspoon of coarse salt, 2 tablespoons of butter, ½ teaspoon of black pepper, 1½ teaspoons of Worcestershire sauce, and ½ teaspoon of thyme. Stir to combine. (Butter may go in unmelted; stir after 1 hour or melt first.)
- Caramelize: Cook with the lid on for 9–10 hours on HIGH or 10–11 hours on LOW, until the onions are softened and deeply golden brown. Check a few hours early and go by color, not just time—stir when checking. Then add 4 cups of beef broth—if using a 2-quart crock pot, add only 2 cups now.
- Simmer: Cook on high for at least 1 hour to allow the flavors to combine. If using a 2-quart, add the remaining 2 cups of broth about 15 minutes before the end.
- Toast & assemble: Toast crusty bread (brushed with butter) in the oven or a frying pan. Arrange ramekins or other oven-safe bowls on a sheet pan. Ladle hot soup into bowls and float the toasted bread on top.
- Cheese: Cover each bowl with provolone, Gruyère, or Swiss cheese.
- Broil until the cheese is bubbly and golden, 2–4 minutes.
Recipe Notes
Pro Tips
Doneness: The onions are ready when softened and deeply golden brown. Check a few hours early and go by color, not just the clock. Crockpot size: As written, a 3–4-quart crockpot is best. A half recipe fits a 2-quart mini; use a 6-quart or larger crockpot for a double recipe. 2-quart crockpot: For a full recipe, add only half the broth after the onions caramelize, then add the rest near the end. Bread and cheese: A crusty French baguette or large croutons work well. Provolone, Gruyère, or Swiss cheese are good choices. Broth: Use good-quality beef broth or stock since it provides much of the soup's flavor. Wine: Optional—add ¼ cup dry sherry, dry white wine, or red wine with the broth. Storage: Refrigerate without bread and cheese for up to 4 days or freeze for 3-4 months.Your Own Private Notes
To adjust the recipe size:
You can adjust the number of servings above; however, only the amount in the ingredient list is adjusted, not the instructions.
Nutrition Estimate (may vary)
Editors Note: Originally published July 12, 2015. Updated with expanded options, refreshed photos, and a table of contents to help navigation.
Lisa Huff says
Oh wow, this looks so good!
Mary says
I've had mine cooking for 2 hrs so far and my house smells Ah-MAZING! Can't wait for dinner tonight.
Mary says
It didn’t disappoint! No burnt onions even cooking on high for 9 hrs. Perfectly carmalized and a fantastic soup!
Emily says
I made this recently and it was SO easy and delish! I ended up buying jarelsburg cheese. I will make this again for sure!
DrDan says
Thanks for the note. It is one of my favorite soups.
Dan
Chris says
At what point to you add the ingredients from 2nd crock pot? 😊
DrDan says
No second crock pot. Carmalize onions then add broth and cook some more. Then is ready to put into bowls with bread and cheese.
Dan
Colette Watts says
Before I make this can you freeze the soup.
Tks
DrDan says
Yep
Cera says
Cut a huge portion of time off by quickly caramelizing your onions in butter prior to adding to the crock pot. Adds a ton more flavor and onions are not mush.
Paige says
What kind of cheese and bread do you prefer to use? And how much of each?
DrDan says
I like a crusty French or Italian bread with Provolone cheese. About 1/2 to 3/4 inch thick slice of the bread to cover the dish and just enough cheese to cover also.
Jennifer says
Should I use yellow onions??
DrDan says
Yellow or white.
Nicole says
So I'm like Dan, mine burned a lil. I started it at 730am, it is now 111pm can i add the broth and let it sit on low all day? The onions are pretty camerlized but my husband and son don't get home till about 5pm
DrDan says
I think some crock pots run too hot for this recipe on high. With your pot, do low next time. Remove from heat now since they are caramelized and refrigerate. Then about an hour and a half before you need it, add the broth and cook on low. It does need to simmer some with the broth and not just reheat.
Willie Mitchell says
Sound delious.. Only thing I dislike onions ?
Dr. Horshenschwartz (from the clinic) says
Excellent. Made it a couple months ago, making it again today with 6 pounds of onions. Smells amazing!
Dan says
You must have a typo. When you cook onions on high for 9 hours you get burnt onions. I know because I did it. I'm mad that I didn't use my own common sense. You should change that to say LOW for 9 hours. Please fix this so others like me dont have their whole house smelling of burnt onions.
DrDan says
Hi Dan...
Sorry it didn't work well for you but high is correct. I did it twice and 9 hours on high worked great in two different pot I have. I check some references before I replied and they are all over the place. 8 hours on low to 14 hours on high. Cooks Country does high for 10-12 hours...
So what went wrong. 1) your crock pot runs hot and/or 2) some variation in the onions.
I'm putting an advisory on the recipe stating to cook to "softened and deep golden brown". You want the caramelization.
Thanks for the note
DrDan
Paula Mencucci says
I had the same problem. Burnt onions....I'm sad because I use the crockpot when I"m not home to cook and when I come home after a long day to ruined dinner, I'm extremely disappointed :( Apparently my crockpot runs hot, but only on one side...
DrDan says
Hi Paula,
I changed some wording about hot pots. I believe it was Crock Pot brand that had the heating element located in one location near the front if I remember right and not around the pot. They had a lot of localized burning from what I understood.
The warning I added about hot pots was if you see boiling when cooking on low, then you should assume a hot pot. On low a crock pot should be 207 or less. Most run right at 200. It is harder to measure the temperature on high since it should be about 250 but some pots run 300. Since both are above the boiling point you can't get an accurate measurement without special equipment. That, of course, does not address hot localized spots.
Again, sorry you had an issue.
Dan
Kathy Heiber says
This is delicious....I have always loved French Onion Soup and now I can have it whenever I want....YAY!!!
rating...+10
Peg says
Do you leave it covered or open?
DrDan says
Covered.
Steven House says
I LOVE french onion soup, but rarely make it since caramelizing the onions is almost a day long affair. For some reason I never considered using my crock pot. I can't wait to try this. Many thanks!
Cheryl S. says
LOVE the onion soup. Even my very picky 10 year old gave it a definite thumbs up! Who knew it could be so easy?!?
DrDan says
Thanks for the note and rating. I have repeated this several times.