Low Fat French Onion Soup: A Recipe to Savor

Let the symphony of flavors dance on your palate as we delve into the world of low fat French Onion Soup. In this culinary journey, I’ll share the techniques and ingredients that transform humble onions into a bowl of pure bliss.

Low Fat French Onion Soup
Crusty bread and melted cheese complete the perfect pairing for our Low Fat French Onion Soup
Low Fat French Onion Soup

Low Fat French Onion Soup

Let the symphony of flavors dance on your palate as we delve into the world of low fat French Onion Soup. In this culinary journey, I'll share the techniques and ingredients that transform humble onions into a bowl of pure bliss.
Prep Time 10 minutes
Cook Time 55 minutes
Course Soup
Cuisine French
Servings 4
Calories 129 kcal


  • 1 large heavy saucepan
  • 4 ovenproof bowls


  • ½ tablespoon unsalted butter
  • 4 medium onions, sliced
  • teaspoon sugar
  • ½ teaspoon dried thyme, crumbled
  • ¼ teaspoon black pepper
  • 2 tablespoons flour
  • 1 tablespoon brandy (optional)
  • 5 cups low-sodium, reduced fat beef broth
  • ½ cup dry white wine  (you could also substitute chicken broth)
  • ¼ cup shredded low fat mozzarella cheese
  • 1 bay leaf
  • 4 slices toasted French bread (preferably whole grain)
  • 2 cloves garlic, sliced in half lengthwise


  • In a large heavy saucepan, melt the butter over medium heat; add the onions and cook, uncovered, until golden – about 8-10 minutes. Blend in the sugar and flour and cook for 3-5 more minutes, stirring constantly.
  • Add the beef broth, wine, thyme,bay leaf, and pepper; increase the heat to medium-high and bring the mixture to a boil, stirring constantly for about 6 minutes. Adjust the heat to a simmer, partly cover the saucepan, and simmer for 30 minutes. After 30 minutes, spoon out the bay leaf and add the brandy (if using).
  • Preheat the oven’s broiler. Rub each piece of bread with the cut side of garlic. Ladle the soup into 4 ovenproof bowls. Place a piece of bread on te top of the liquid in each bowl and sprinkle the top of each with a tablespoon of cheese.
  • Place the bowls in the oven 4-6 inches from the heat, and broil until the cheese is golden brown (about 2-3 minutes).



For a deeper flavor, take your time caramelizing the onions on low heat until they turn a rich golden brown. Patience is key to achieving the perfect sweetness and depth in every spoonful. Hungry for more? Find the full recipe on my blog and subscribe to receive more mouthwatering recipes directly to your inbox.
Keyword onion

Alternative Method: Instant Pot

Low Fat French Onion Soup
The aroma of slow-cooked caramelized onions fills the kitchen, promising a flavorful soup


  • 4 large yellow onions, thinly sliced
  • 2 tablespoons olive oil
  • 1 teaspoon granulated sugar
  • 4 cups low-sodium beef or vegetable broth
  • 1/4 cup dry white wine
  • 1 teaspoon Worcestershire sauce
  • 1 bay leaf
  • Salt and pepper to taste
  • 4 slices of reduced-fat Swiss cheese or Gruyere
  • 4 slices of whole-grain bread, toasted


  1. Set your Instant Pot to the sauté function and heat the olive oil. Add the sliced onions and sauté for about 5 minutes until they start to soften.
  2. Sprinkle the sugar over the onions and continue cooking for another 15 minutes, stirring occasionally, until the onions are caramelized.
  3. Pour in the white wine and deglaze the pot, scraping any browned bits from the bottom.
  4. Add the beef or vegetable broth, Worcestershire sauce, bay leaf, and season with salt and pepper to taste.
  5. Close the Instant Pot lid and set the valve to the sealing position. Cook on high pressure for 10 minutes.
  6. Once the cooking time is complete, allow for a natural pressure release for about 10 minutes, then perform a quick release to release any remaining pressure.
  7. Preheat the broiler in your oven. Ladle the soup into oven-safe bowls or ramekins.
  8. Place a slice of toasted whole-grain bread on top of each bowl of soup, then cover with a slice of reduced-fat Swiss cheese or Gruyere.
  9. Transfer the bowls to a baking sheet and place under the broiler until the cheese is melted and bubbly, about 2-3 minutes.
  10. Carefully remove the bowls from the oven and let them cool slightly before serving. Be cautious, as they will be hot.
  11. Serve the low-fat French Onion Soup with a side of crusty bread or a light salad for a complete meal.

Note: Please refer to your Instant Pot’s instruction manual for specific usage guidelines and safety precautions when operating the appliance.

Cooking Tips

Low Fat French Onion Soup
A steaming bowl of low-fat French Onion Soup, a comforting delight for any occasion

Unlocking the full potential of Low Fat French Onion Soup requires attention to detail and a few expert techniques. In this section, I’ll share valuable cooking tips and insights to ensure the best results. I’ll also highlight common mistakes to avoid, allowing you to create a bowl of soup that’s bursting with flavor and satisfaction.

Offer tips and tricks to ensure the best results:

  • Use a mix of yellow and red onions for a well-rounded flavor profile. The sweetness of the red onions complements the robustness of the yellow onions.
  • To achieve perfectly caramelized onions, cook them slowly over low heat. This process takes time but is crucial for developing the deep, rich flavors that are characteristic of French Onion Soup.
  • Stir the onions frequently during the caramelization process to prevent burning and ensure even cooking. Adding a pinch of salt can help draw out moisture from the onions and speed up the caramelization process.
  • Enhance the umami depth by deglazing the pot with a splash of dry white wine or sherry before adding the broth. This step adds complexity to the soup’s flavor profile.

Share insights on common mistakes to avoid:

  • Avoid rushing the caramelization process by turning up the heat too high. This can lead to unevenly cooked onions and a burnt flavor.
  • Be cautious with salt. Remember that the broth and cheese will add some saltiness to the soup, so it’s best to taste and adjust the seasoning towards the end of the cooking process.
  • Don’t overcook the soup after adding the broth. Simmering for too long can result in mushy onions and a loss of texture.
  • Use a good-quality low-sodium broth or make your own to control the salt content. Pre-made broths can vary in sodium levels, so always check the labels.
  • Avoid overcrowding the pot when caramelizing the onions. If necessary, work in batches to ensure even heat distribution and proper caramelization.

Serving Suggestions

Low Fat French Onion Soup
Delight your guests with the elegance of French Onion Soup

When it comes to enjoying a bowl of Low Fat French Onion Soup, the possibilities are endless. From cozy weeknight dinners to elegant gatherings, this versatile dish is sure to impress. Let’s explore some creative serving suggestions that will elevate your dining experience and ensure that every spoonful is a delightful journey of flavors.

When to Serve Low Fat French Onion Soup:
Low-fat French Onion Soup is perfect for various occasions. It can be a comforting meal on a chilly evening, a satisfying lunch option, or even a starter for a special dinner party. Its rich flavors and warm aroma make it a crowd-pleaser for all seasons.


  • For a cozy weeknight dinner, pair the soup with a crusty whole-grain bread and a simple green salad.
  • Serve it as a starter for a dinner party, impressing your guests with its elegance. Consider offering small portions in charming mini soup bowls or cups.

Complementary Sides, Garnishes, and Beverages:
To complement the flavors of low-fat French Onion Soup, consider these delightful additions:

  • Sides: Crusty bread, such as baguette slices or whole-grain rolls, are perfect for dipping into the soup. You can also offer a selection of artisanal crackers or a light, refreshing side salad.
  • Garnishes: Sprinkle each bowl with fresh chives or parsley for a pop of color and added freshness. For a touch of indulgence, top the soup with a small dollop of reduced-fat sour cream or Greek yogurt.
  • Beverages: Pair the soup with a crisp white wine like Sauvignon Blanc or a light-bodied red like Pinot Noir. Alternatively, a warm cup of herbal tea or a sparkling water with a twist of lemon can provide a refreshing contrast.

Different Ways to Serve Low-Fat French Onion Soup:
While the traditional presentation of French Onion Soup is classic and delicious, feel free to experiment with different serving styles to add a unique touch to your dining experience:

  • Mini Soup Shooters: Serve the soup in shot glasses or small cups as an appetizer at a cocktail party. It allows guests to enjoy the comforting flavors in a fun and elegant way.
  • Bread Bowl Variation: Hollow out a round bread loaf, such as a sourdough or a crusty boule, and ladle the soup into the bread bowl. This creates a hearty and rustic presentation that’s both delicious and visually appealing.
  • Individual Ramekins: Portion the soup into individual oven-safe ramekins, top with a slice of toasted baguette and cheese, and broil until golden and bubbly. This individual serving option adds a touch of sophistication to your dining table.

FAQs about Low Fat French Onion Soup

Low Fat French Onion Soup
Savor the richness of low-fat French Onion Soup, a satisfying option for a light lunch

Preparing low-fat French Onion Soup may raise some questions along the way. In this section, I’ll address the most frequently asked questions to provide clarity and guidance. From storage tips to ingredient substitutions, let’s dive into these common queries to ensure a seamless cooking experience.

Can I make Low Fat French Onion Soup in advance and store it?
Absolutely! Low Fat French Onion Soup can be made in advance and stored for later enjoyment. Once the soup has cooled to room temperature, transfer it to an airtight container and refrigerate for up to 3 days. When ready to serve, gently reheat the soup on the stovetop over low heat, stirring occasionally until heated through. Remember to adjust the seasoning if needed before serving.

Can I substitute the onions with other vegetables?
While onions are the star ingredient in French Onion Soup, you can experiment with different variations by incorporating other vegetables. Thinly sliced leeks or shallots can add a unique twist to the flavor profile. However, keep in mind that the taste and texture of the soup may vary from the traditional version.

Can I freeze Low Fat French Onion Soup?
Yes, you can freeze low-fat French Onion Soup for future enjoyment. Allow the soup to cool completely before transferring it to freezer-safe containers or zip-top bags. Leave some room for expansion, as the liquid will expand when frozen. Label the containers with the date and freeze for up to 3 months. To thaw, place the soup in the refrigerator overnight and then reheat gently on the stovetop.

What are some creative ways to use leftover French Onion Soup?
If you have leftover Low Fat French Onion Soup, don’t let it go to waste! Here are a few ideas to repurpose those delicious flavors:

  • Use it as a base for a hearty beef stew by adding chunks of cooked beef and your favorite vegetables.
  • Transform it into a flavorful gravy to accompany roasted meats or mashed potatoes.
  • Blend it with cooked lentils or beans to create a hearty and nutritious soup.
  • Use it as a broth for cooking rice or quinoa, infusing them with a delightful onion flavor.

Warm, comforting, and low in fat, our French Onion Soup recipe is a must-try for soup enthusiasts. Uncover expert insights on cooking techniques, such as slow caramelization and deglazing, to achieve a depth of flavors. Delight your senses with diverse serving suggestions, whether it’s for a cozy dinner or an elegant gathering. Don’t miss the chance to share this delectable recipe and subscribe to our blog for more culinary inspiration.

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