French Onion Soup with Slow Cooker Caramelized Onions

French Onion Soup

The very first thing I ate after arriving in Paris last Spring was French Onion Soup.  Of course in Paris it is not called French Onion Soup – it is called Soupe à l’oignon.  No need for the French part because you’re in France!

Whenever I go to a restaurant that has French Onion Soup on the menu I order it.  I love it but I had never made it at home.  I had decided it was just too hard to make at home.  I am happy to report that I was wrong!!
Remember those Slow Cooker Caramelized Onions I shared a few weeks ago?  Well, they make a perfect onion soup and make it so easy.

French Onion Soup

I used a cup of caramelized onions that I had put away in the freezer. You could use more but I don’t like my soup too oniony.

I had a delicious bowl of french onion soup in no time at all!!  French Onion soup is made with a base of beef broth.  I actually used a combination of beef and chicken and then it is topped with some toasted baguette and covered in cheese!!  Place it under the broiler and you have Soupe à l’oignon.  Translation:  delicious!

French Onion Soup

Here’s how I did it.  I made my broth and added the caramelized onions.  I sliced a baguette and then brushed the bread with a little olive oil and placed it under the broiler to toast.

French Onion Soup

I then placed the bread on top of the soup and covered it with a couple of slices of Swiss cheese.  Then covered that with mozzarella cheese! My favorite part of French onion soup is the cheesy part on top. Lots of ooey, gooey cheese!
French Onion SoupI then placed the bowl onto a cookie sheet and placed it under the broiler.  Watch it carefully and pull it out when the cheese has melted and gotten bubbly and golden brown on top.

French Onion Soup

Then grab a spoon and dig it!!  Just close your eyes and imagine yourself sitting at a little sidewalk cafe in Paris!  Oh la la!!

French Onion Soup

From some other tastes from France try these:

French Cream Puffs and Eclairs



French Macarons


Crepe Bar


French Onion Soup with Slow Cooker Caramelized Onions


  • 1 C caramelized onions
  • 32 oz. chicken broth
  • 32 oz. beef broth
  • 1 Tbsp Worcestershire sauce
  • 1 tsp parsley
  • 1/4 tsp thyme
  • 1 bay leaf
  • 1 Tbsp balsamic vinegar
  • salt and pepper to taste
  • 4 slices of French bread/baguette
  • olive oil
  • 8 slices of Swiss cheese
  • 1/2 C shredded Mozzarella cheese


  • Mix together broths, Worcestershire sauce, seasonings.
  • Add in caramelized onions
  • Simmer for 20 minutes.
  • Remove bay leaf and reduce heat.
  • Add in vinegar and season as necessary with salt and pepper.
  • Cover and keep on low heat until ready to serve.
  • Slice french bread,
  • Brush with olive oil and place on cookie sheet.
  • Place under broiler until golden brown
  • Place slice of bread on top of bowl of soup.
  • Cover with 2 slices of Swiss cheese
  • Add 1/8 C of shredded Mozzarella Cheese
  • Place under broiler until cheese is melted, bubbly and beginning to brown.


For directions on how to make caramelized onions go to

Recipe adapted from


Leigh Anne


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  1. 1
    Vanessa says:

    I love french onion soup but for some reason I’ve never made it. I make everything else. This looks so good!
    Vanessa recently posted..Easy DIY Hash Browns

  2. 2
    Tiffany says:

    I am not a big onion fan and therefore I’ve never cared for this soup much. My aunt has a great recipe that she got from a hotel she use to work at. Your pictures look great and have me wanting to give it a try, again!
    Tiffany recently posted..Crockpot Meatball Sliders

  3. 3
    Mique says:

    Hello! I’m drooling!! YUMMMMM. I want this right now.
    Mique recently posted..Fabulous Group Holiday Giveaway with 2 Prize Packages!

  4. 4
    Emily says:

    I am the only lover of this soup at my house so I am excited to make this when my brother comes to visit. Looks so yummy!

  5. 5
    Kristy says:

    Hi there, I came across your blog on Pinterest & just wanted to let you know that your tutorials page appears to be down. It reads, “[catlist id=727 catlist thumbnail=yes numberposts=20]“

  6. 6
    Sarah says:

    Yum! What kind of onions did you use? Yellow or white or sweet?
    Sarah recently posted..A Few Things

    • 6.1
      Leigh Anne says:

      You can use either yellow or white. Don’t really need sweet because the onions sweeten up as they cook for so long. I think I used yellow this time because that is what I had.

  7. 7
    Tara says:

    My hubby loves French Onion Soup. I’ll have to give it a try.
    Tara recently posted..Pumpkin Pie Puppy Chow

  8. 8
    Emmy says:

    Thanks, it turned out good! I wish i had seen the carmalized onion directions first though. Think mine werr half fried. Lol


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