Jun 09 2026
RestaurantsRed White and BrewBaked Homemade Onion Soup Recipe

Baked Homemade Onion Soup Recipe

Inspired by Red White and Brew
Time1h 15m
Serves4

Topped with crostini and mozzarella

Was this page helpful?

Help improve this recipe for others.

Send this recipe to your inbox.

We'll email it straight to you - plus weekly cooking inspiration.

Ingredients

Some product links may be affiliates. If you buy through them, you're supporting the site and Pekin may earn a commission at no extra cost to you.

Soup Base

Crostini

Method

Soup Preparation

  1. 1

    Sauté the Onions

    In a large pot, melt the butter over medium heat. Add the sliced onions and sauté for about 15-20 minutes, stirring occasionally, until they are caramelized and golden brown.

  2. 2

    Add Garlic

    Mince the garlic cloves and add them to the pot with the caramelized onions. Cook for an additional 2 minutes until fragrant.

  3. 3

    Combine Broth and Seasoning

    Pour in the beef broth and add the thyme, bay leaves, salt, and black pepper. Stir to combine and bring to a boil.

  4. 4

    Simmer

    Reduce the heat to low and let the soup simmer for about 30 minutes to allow the flavors to meld together. Adjust seasoning as necessary.

Crostini Preparation

  1. 5

    Prepare the Baguette

    Preheat the oven to 400°F (200°C). Slice the baguette into ½ inch thick slices.

  2. 6

    Season and Toast

    Brush both sides of the baguette slices with olive oil and sprinkle them with garlic powder. Place them on a baking sheet and bake for about 10-12 minutes, or until they are golden and crispy.

Assemble and Bake

  1. 7

    Combine Soup and Cheese

    Once the soup is ready, remove the bay leaves. Ladle the soup into oven-safe bowls or ramekins, filling them about ¾ full. Top each bowl with a generous amount of mozzarella and parmesan cheese.

  2. 8

    Bake

    Place the bowls on a baking sheet and bake in the preheated oven for about 15 minutes, or until the cheese is melted and bubbly.

  3. 9

    Serve with Crostini

    Remove from the oven and let cool slightly. Serve the baked onion soup hot, topped with the crispy crostini on the side.

More from Red White and Brew