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Best Ever French Onion Soup Recipe

If you love soup then you are going to go crazy for this onion soup recipe.

Best Ever French Onion Soup Recipe

Ingredients

  • 4 Tbsp. olive oil
  • 2 Tbsp. butter
  • 6 cups yellow onions, thinly sliced
  • 1 tsp salt 1/2 tsp sugar
  • 3 Tbsp. flour 6 cups beef stock 1 cup white wine
  • 1/2 tsp ground sage
  • 1 whole bay leaf
  • 1 loaf french bread, or baguette
  • 2 Tbsp. olive oil 1/2 an onion, grated
  • 3 Tbsp. cognac (optional)
  • 12 oz Swiss cheese
  • Salt
  • Pepper
  • 4 oz parmesan cheese

Instructions:

Preheat Oven To 325˚F/160˚C

1. In a large pot over medium-low heat, heat olive oil and add butter.

2. Once the butter is melted, stir the onions and coat with oil and butter. Cover and cook for 20 minutes, checking occasionally.

3. Turn up the heat to medium-high. Add 1/2 tsp salt and sugar. Stir & keep cooking until onions are brown and caramelized. (the bottom of the pan will develop some browning, it’s very important!)

4. Stir in flour one tablespoon at a time and cook for about 30 seconds.

5. Add 1 cup of the beef broth. Use a whisk to scrape up (deglaze) the browned bits stuck on the bottom of the pan.

6. Add the remaining 5 cups of beef stock, wine, sage and bay leaf. Bring to a boil. Reduce heat and simmer, uncovered, for 40 minutes.

7. In the meantime, cut the french bread or baguette into 1/2 inch thick pieces. Brush with oil on both sides and bake at 325˚F/160˚C for 30 minutes, flipping halfway. Once they are done, increase oven temperature to 350˚F/175˚C.

8. In an oven safe bowl, pour the onion soup, filling about 3/4 of the way full. Top with a piece of baked french bread, and generously sprinkle swiss and parmesan on top.

9. Bake for 2-3 minutes or until the cheese has melted completely and become slightly golden.

10. Serve & enjoy!!

Robyn Foyster

Robyn Foyster is a multi‑award‑winning journalist, tech entrepreneur, and founder of The Carousel, Women Love Tech, Women Love Travel and Game Changers. With over 30 years’ experience across print, digital, TV, and immersive media, she’s been at the forefront of shaping Australia’s female narrative Robyn’s mission for The Carousel is to empower women through expert-driven, impact-focused storytelling. Whether it’s wellness, career, personal growth, or eco-conscious living, the platform is guided by her belief that well-informed women can change the world.