Dutch Oven French Onion Soup (Printable Version)

Deeply savory soup with slow-cooked caramelized onions, crispy bread, and melted Gruyère cheese topping.

# Ingredient List:

→ Onions

01 - 5 large yellow onions, thinly sliced

→ Aromatics

02 - 3 tablespoons unsalted butter
03 - 2 tablespoons olive oil
04 - 2 garlic cloves, minced
05 - 1 teaspoon sugar

→ Broth & Flavorings

06 - 8 cups beef broth or vegetable broth for vegetarian option
07 - 1/2 cup dry white wine
08 - 2 teaspoons fresh thyme leaves or 1 teaspoon dried thyme
09 - 2 bay leaves
10 - 1 tablespoon Worcestershire sauce
11 - Salt and freshly ground black pepper to taste

→ Topping

12 - 1 baguette, sliced into 1/2-inch thick rounds
13 - 2 cups Gruyère cheese, grated
14 - 1/2 cup Parmesan cheese, grated optional

# Steps:

01 - In a large Dutch oven over medium heat, melt the butter with olive oil. Add the sliced onions and sugar. Cook, stirring frequently, until onions are very soft and deeply caramelized, approximately 40 to 45 minutes.
02 - Add the minced garlic and cook for 1 minute until fragrant.
03 - Pour in the wine, scraping up any browned bits from the bottom of the pot. Simmer for 2 to 3 minutes until slightly reduced.
04 - Add the broth, thyme, bay leaves, and Worcestershire sauce. Bring to a simmer, reduce heat, and cook uncovered for 20 to 30 minutes. Season with salt and pepper to taste. Remove bay leaves before serving.
05 - While soup simmers, preheat oven broiler. Arrange baguette slices on a baking sheet and toast under the broiler until golden, approximately 1 to 2 minutes per side.
06 - Ladle soup into oven-safe bowls. Top each with a toasted baguette slice and generous handful of Gruyère cheese, and Parmesan if using.
07 - Place bowls on a baking sheet and broil until cheese is melted and bubbling, 2 to 4 minutes.
08 - Transfer bowls carefully to serving plates and serve immediately, garnished with extra thyme if desired.

# Expert Advice:

01 -
  • The caramelized onions become so soft and sweet you'll forget they ever tasted sharp or peppery.
  • That moment when melted cheese bubbles under the broiler is pure kitchen theater—crispy, gooey, and absolutely worth the few minutes of attention.
  • It's the kind of soup that tastes like someone spent all day cooking for you, but you'll have it ready in an hour and a half.
02 -
  • Don't skip the long caramelization time thinking you can rush it by turning up the heat—high heat burns onions instead of sweetening them, and no amount of extra cooking fixes that bitter flavor.
  • If you use a bowl that's not oven-safe or has a plastic handle, your cheese topping will be perfect but your bowl will melt slightly, which is a lesson I learned the hard way with a beautiful ceramic piece.
03 -
  • If your onions aren't browning after thirty minutes, the heat might be too low or your pot is too crowded with onions—give them space and a bit more heat to develop that deep color.
  • Grate your cheese fresh right before assembling rather than using pre-shredded, which contains anti-caking agents that prevent that smooth, creamy melt and can make it grainy.
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