Onion soup with garlic and cheddar croutons

Onion soup with garlic and cheddar croutons features caramelized onions and leeks simmered in beef broth and red wine, topped with crispy cheese-covered croutons. This hearty, comforting dish is perfect for chilly days.

06 Dec 2025
Cook time 45 min
Prep time 15 min

Ingredients:

2 tbsp butter
2 red onions
2 leeks
2 garlic cloves
2 tbsp all-purpose white wheat flour
1/2 cup red wine
4 cups beef broth
1 tbsp fresh thyme
1 baguette (french bread)
1/2 cup cheddar cheese
Onion soup with garlic and cheddar croutons

Onion soup with garlic and cheddar croutons is a delightful and hearty dish that combines the rich, savory flavors of caramelized onions and leeks with the robust taste of beef broth and red wine. Topped with crispy croutons covered in melted cheddar cheese, this soup is perfect for any cold day or when you're in need of some comfort food.

Instructions:

1. Prepare the Ingredients:
- Thinly slice the red onions and leeks (white and light green parts only).
- Mince the garlic cloves.
- Slice the baguette into 1/2 inch thick rounds.
- Grate the cheddar cheese.
- Preheat your oven to 375°F (190°C).
2. Caramelize the Onions and Leeks:
- In a large pot or Dutch oven, melt the butter over medium heat.
- Add the sliced red onions and leeks. Cook, stirring occasionally, until they are soft and caramelized, about 20-25 minutes.
- Add the minced garlic and cook for an additional 1-2 minutes until fragrant.
3. Make the Soup Base:
- Sprinkle the flour over the caramelized onions and leeks, stirring well to combine. Cook for 1-2 minutes to get rid of the raw flour taste.
- Pour in the red wine, stirring constantly, and cook until the wine reduces slightly, about 2-3 minutes.
- Gradually add the beef broth, stirring continuously.
- Add the fresh thyme. Bring the mixture to a boil, then reduce the heat and let it simmer for about 30-35 minutes. Season with salt and pepper to taste.
4. Prepare the Cheddar Croutons:
- While the soup is simmering, arrange the baguette slices on a baking sheet.
- Place the baking sheet in the preheated oven and bake for 5-7 minutes until the bread is lightly toasted.
- Remove the baking sheet from the oven and top each baguette slice with grated cheddar cheese.
- Return the baking sheet to the oven and bake for an additional 3-5 minutes, or until the cheese is melted and bubbly.
5. Serve:
- Ladle the hot onion soup into bowls.
- Float a few cheddar croutons on top of each bowl of soup.
- Optionally, garnish with additional fresh thyme or a sprinkle of grated cheddar cheese.
- Serve immediately and enjoy your delicious Onion Soup with Garlic and Cheddar Croutons!

This onion soup with garlic and cheddar croutons is a classic dish that will warm your soul. It's easy to prepare and the combination of the rich broth with the cheesy croutons makes for a truly satisfying meal. Enjoy it with a glass of red wine or some crusty bread on the side, and you have a perfect dinner ready to be served.

Onion soup with garlic and cheddar croutons FAQ:

How long should I simmer the soup?

You should simmer the soup for about 30-35 minutes after bringing it to a boil. This allows the flavors to meld together nicely.

Can I substitute red wine with something else?

Yes, you can substitute red wine with additional beef broth or a splash of vinegar for acidity if you prefer a non-alcoholic option.

What is the best way to store leftover onion soup?

Store leftover onion soup in an airtight container in the refrigerator for up to 3 days. Reheat gently on the stove before serving.

What type of pan should I use to caramelize the onions?

A large pot or Dutch oven works best for caramelizing the onions, as it provides even heat distribution and enough space for the onions to cook down.

How do I know when the onions are caramelized?

The onions are properly caramelized when they become soft, deep golden in color, and have a sweet aroma, typically taking about 20-25 minutes on medium heat.

Tips:

- For a deeper flavor, allow the onions to caramelize slowly over medium-low heat. This process can take up to 30 minutes but is worth the effort.

- Use a good quality beef broth for the best taste. Homemade broth is always a great option if you have the time.

- If you prefer a smoother soup, you can blend the onions and leeks before adding the croutons.

- To make the croutons extra crispy, you can drizzle olive oil over the baguette slices before toasting them.

- Feel free to experiment with different cheeses for the croutons. Gruyère or Swiss cheese can be excellent alternatives to cheddar.

Nutrition per serving

4 Servings
Calories 330kcal
Protein 11g
Carbohydrates 40g
Fiber 4.64g
Sugar 9g
Fat 12g

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