French Onion Soup Casserole Recipe | LaaLoosh (2024)

By Wendy Zitzman

French Onion Soup Casserole Recipe | LaaLoosh (1)

French Onion Soup has always been one of my favorite dishes…who doesn’t love the idea of toasted bread and gooey cheese, melted all over a hot and flavorful onion soup?

But the traditional French Onion Soup recipe is not low calorie or Weight Watchers friendly. I’ve tried a few pre-made, low calorie versions that I’ve found in grocery stores but the taste is either blah or the portion is super small. So I set out on a journey to make my own but also decided to make it as a casserole, just because I was hungry and wanted a meal that had some substance.

It was so easy to make and the finished product was delicious! All the flavors that I love but for fewer Points. And making it into a casserole was really easy. It just basically the soup with more onions and less broth. If you want to make this dish as a soup, just use more broth when making it. So simple, yet so perfect.

And each very large serving is just 5 Points. This low calorie French Onion Soup Casserole Recipe is perfect for warming up on a cold day.

Enjoy!

French Onion Soup Casserole Recipe | LaaLoosh (2)

A casserole version of traditional French Onion Soup, this dish is a real winner. Each serving is very big, and you get all the delicious flavors that are expected. A perfect, low calorie recipe to warm you up on a cold winter day.

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Prep TimePrep Time 20 minutes mins

Cook TimeCook Time 45 minutes mins

Total TimeTotal Time 1 hour hr 5 minutes mins

ServingsServings 4

CaloriesCalories 237 kcal

Equipment

  • 1 Dutch Oven

  • 1 Oven

Ingredients

  • 5 medium onions - thinly sliced
  • 2 tbsp light butter
  • 1 cup fat free beef broth
  • ½ cup red wine
  • 3 garlic cloves
  • loaf French baguette
  • 4 slices light Swiss cheese - I used Jarlsberg
  • 1 tbsp Worcestershire sauce
  • 1 tbsp balsamic vinegar
  • 1 tsp paprika
  • 1 tsp dried thyme
  • 1 tsp salt
  • ½ tsp black pepper

Instructions

  • Set a large pot or Dutch oven medium high heat, melt butter and add in onions, garlic and salt.

  • Cook, stirring frequently until onions become caramelized, about 30-40 minutes.

  • If onions start to stick to pan, just stir a tbsp or two of the broth as needed.

  • Once onions are caramelized, add in the broth, wine, Worcestershire sauce, paprika, pepper and thyme. Simmer over medium heat for 20 minutes, stirring occasionally.

  • Turn heat to low and add in vinegar and season with additional salt and pepper if desired. Cover and keep over low heat to stay hot while you prepare the bread.

  • Preheat oven broiler. Slice 1/3 of a loaf of French baguette into about 12 slices.

  • Spray a baking sheet with nonfat cooking spray, and arrange baguette slices evenly on sheet. Lightly mist again with an olive oil mister or the nonfat cooking spray and then place in oven for 3 minutes on each side, or until bread is well toasted on both sides.

  • Remove bread from oven and set it to bake on 375 degrees.

  • Pour onion mixture into an 8X8 casserole dish. Top evenly with bread slices and then cover evenly with Swiss cheese slices.

  • Place casserole dish into oven and let bake until cheese is melted and bubbly and beginning to brown, about 10-15 minutes. Serve immediately.

Nutrition

Serving: 1.5 cupsCalories: 237 kcal (12%)Carbohydrates: 29 g (10%)Protein: 11 g (22%)Fat: 5 g (8%)Fiber: 3 g (13%)

Cuisine: French Recipes

Diet: Low Calorie Recipes, Low Fat Recipes, Vegetarian Recipes

Main Ingredient: Vegetable Recipes

Category: Casserole Recipes

Tried this recipe?Let me know how it was!

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AuthorWendy Zitzman

As your average, every day, All American woman, I look forward to sharing with you my thoughts and ideas on many different topics that interest me such as dieting, health & fitness. Trust me when I tell you that this is one site you NEED to bookmark! I have the most amazing recipes with Weight Watchers Points that you won’t believe are low calorie! As an avid Weight Watchers follower, I have learned so many helpful tips and tools over the years that I am eager to share.

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    20 Comments

    1. barb9 years agoReply

      Followed exact directions. No problem with extra soup. This is Great! Thanks.

    2. Sarah11 years agoReply

      About to assemble – but my onions seem like they’re too “soupy”. How much liquid should be in the onion mixture?

    3. Gail11 years agoReply

      How does this make 4 servings of 1-1/2 cups each with only 1-1/2 cups total liquid?

    4. Dana11 years agoReply

      Got very excited coming across this recipe only to find out it’s not actually vegetarian. I’m sure that vegetable broth would not make this taste the same.

    5. Chriseda Howard11 years agoReply

      I just wanted you to know that I made this for my husband and myself this week and we both loved it. Thank you so much for the tip about using some broth to keep the onions from sticking to the pot, that was a real issue for me.

    6. Heather Mathieson11 years agoReply

      Considering I cook for 1… how well do you think this would keep/reheat??

    7. Gigi11 years agoReply

      I made this tonight and it was very tasty. I wouldn’t call it a casserole it was too soupy, We ate it as a soup… I followed the directions exactly,

    8. Rebecca O'Malley11 years agoReply

      this sounds great. do you think you could make the soup mixture ahead of time and refrigerate then just heat up with bread, cheese, etc later?

      • laaloosh11 years agoReply

        Sounds like a good idea! I think it should work fine….

    9. KatieQ11 years agoReply

      This casserole should not be classified as vegetarian because it is made with beef broth and Worcestershire sauce which contains anchovies..

      • Beth Baker11 years agoReply

        Easily remedied by subbing beef flavored veggie broth and anchovy free worcestershire …….but the last bottle of Worcestershire I picked up – no longer listed anchovies in the ingredients.

    10. Steph11 years agoReply

      Caramelize onions for 30-40 minutes?

      • laaloosh11 years agoReply

        Yes.

      • k l11 years agoReply

        they are wonderful.

      • Cate9 years agoReply

        That is what makes it so yummy!!!!!. I always cook them slow on low heat, but this is the best recipie I have found. I dont have the individual crocks and it still taste the same!

    11. Michelle Englehart Miller11 years agoReply

      Sounds delish, but to clarify, you’d have to use veg broth for this to be vegetarian.

    12. Just One Boomer (Suzanne)11 years agoReply

      Perfect for winter comfort food for those of us up in the northeast blue states.

    13. Elizabeth @ Food Ramblings11 years agoReply

      making it this weekend!!!

    14. Judy@lifeonthefoodchain.com11 years agoReply

      This is pure genius! If it wasn’t 8 AM I’d run and make it now…it may be on tonights dinner menu, though. Looks delish.

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    Food Recipes

    French Onion Soup Casserole Recipe | LaaLoosh (2024)

    FAQs

    How do you deepen the flavor of French onion soup? ›

    A few sprigs of thyme and a bay leaf elevate the soup even more, but I take it a step further, adding a splash of fish sauce for complexity and depth—don't worry, it won't taste fishy—and a hit of cider vinegar to balance some of that oniony sweetness.

    Should you cook onions before putting in casserole? ›

    Not par-cooking vegetables, pasta, grains, or rice.

    Often a quick 2-5 minutes in the microwave will just give them that great head-start. And if you're using onions in your casserole, you can sauté them for a few minutes to deepen their flavor and avoid any raw onion taste in your finished dish.

    What is the difference between onion soup and French onion soup? ›

    What is the Difference Between Onion Soup and French Onion Soup? French onion soup is always made with beef stock. Other onion soups can be made with chicken, vegetable, or beef stock. Additionally, French onion soup typically contains wine or sherry, which isn't typical or necessary in other onion soups.

    What is the etiquette for eating French onion soup? ›

    With such a soup, a knife is your friend, not your enemy. Using both the soup spoon and the knife, push the baked cheese against the rim of the cup or bowl and cut it gently with the knife. Once you've broken the cheese barrier, you can use the knife again to nudge bits of cheese onto the spoon.

    Why do you put baking soda in French onion soup? ›

    The caramelized onions for this soup cook more quickly due to a pinch of baking soda but still have that deep, slow-cooked flavor. Topping the soup with hot, cheesy toasts prepared while the soup simmers, eliminates the need to bake the soup in specialty French onion soup bowls.

    Why is my French onion soup so bland? ›

    Most likely it could be from not caramelizing the onions long enough, as this is crucial for flavor development. Also, be sure to use a good quality broth and season the soup properly with salt and pepper. You can try adding a splash of balsamic vinegar or Worcestershire sauce for a boost of flavor.

    Are red or yellow onions better for French onion soup? ›

    Onions: You can use white, yellow or red onions for French onion soup. But to make it the classic way, you will need 5-6 large yellow onions, peeled and thinly sliced. Butter: The tastiest (French) way to caramelize those onions.

    What broth is French onion soup made of? ›

    What Is French Onion Soup? French onion soup, or soupe à l'oignon gratinée, is a classic French dish made with caramelized onions and beef stock or broth. The soup is topped with bread and cheese, then gratinéed to rich, gooey perfection. It's traditionally served in a ramekin or a ceramic crock with a handle.

    Why is French onion soup so expensive? ›

    First, French onion soup calls for a ton of onions. While onions aren't expensive, there's a lot of labor involved in halving, peeling, and slicing 10, 12, 50, or one billion onions (I don't know how much soup you make).

    Do people in France eat French onion soup? ›

    The food writer Waverley Root comments that the origins of French onion soup may lie in Alsace, although the dish is popular throughout France and "apparently no region lays particular claim to it". Onion soups from other regions include the tourain from Quercy-Périgord and the ouliat from the Béarn.

    Is French onion soup good for your gut? ›

    Onions are a great source of soluble fibre and therefore a good prebiotic; food for the good gut bacteria. Optimal gut health is crucial for weight loss and this delicious soup provides great nutrients to help boost weight loss as part of a weight management programme.

    How should I cut my onions for French onion soup? ›

    Get the oven to 400 degrees while you prepare the onions: Cut down through the poles of each onion, down through the root end into and through the stem end. Peel each half, keeping the flesh tethered at the root end. Slice 1/4-inch thick longways, pole-to-pole, using a mandolin if you have one.

    How do you make French onion soup not bland? ›

    The next time you're mixing up a pot of French onion soup, toss in a few bay leaves to upgrade the flavor a little more. The bold flavors can complement the taste of the soup and make for a more flavorful dish.

    How do you add depth of flavor to soup? ›

    "If your broth is lacking in savory richness, try adding roasted onion, tomato paste, mushrooms, seaweed, soy sauce, or miso. These ingredients add umami flavor and depth to broth," she says.

    How to doctor up canned French onion soup? ›

    Some fresh rosemary or thyme brings a woody, peppery taste to the soup, complementing the umami flavor of the beef stock. With a splash of balsamic vinegar and green onions or fresh basil as a garnish, the canned soup is transformed from a grocery store original into a gourmet dish.

    How do I make my French onion soup darker? ›

    The caramelized onions are what give the soup its rich dark flavor and color, so don't skimp! Use a good quality beef broth. We use Better Than Bouillon to make our beef broth because it's extremely flavorful and contains a decent amount of salt, which seasons the soup well.

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