Quick Onion Soup Gratin (Print View)

Classic French onion soup in 35 mins, finished with toasted baguette and melty cheese.

# Components:

→ Vegetables

01 - 4 large yellow onions, thinly sliced
02 - 2 cloves garlic, minced

→ Liquids

03 - 6 cups vegetable broth
04 - 1/4 cup dry white wine (optional)

→ Dairy

05 - 4 tablespoons unsalted butter
06 - 1.5 cups grated Gruyère cheese
07 - 1/4 cup grated Parmesan cheese

→ Breads

08 - 4 slices baguette, toasted

→ Herbs & Spices

09 - 1 teaspoon sugar
10 - Salt and black pepper, to taste
11 - 1 teaspoon dried thyme
12 - 1 bay leaf

# Directions:

01 - Melt butter in a large saucepan over medium heat. Add onions, sugar, and a pinch of salt. Sauté, stirring frequently, until onions are soft and golden, about 10 minutes.
02 - Add minced garlic and cook for 1 minute, stirring constantly. Incorporate dried thyme and bay leaf.
03 - Pour in dry white wine and let simmer for 2 minutes, allowing it to reduce slightly. Add vegetable broth, bring to a gentle simmer, and cook uncovered for 10 minutes. Remove and discard the bay leaf. Adjust seasoning with salt and black pepper.
04 - While soup simmers, preheat broiler. Toast baguette slices until golden. Ladle soup into broiler-safe bowls.
05 - Top each bowl with a toasted baguette slice. Cover generously with Gruyère and Parmesan cheese.
06 - Place bowls under broiler for 2 to 4 minutes, or until the cheese is melted and bubbling. Serve immediately.

# Expert Advice:

01 -
  • The secret shortcut: fast caramelization still builds that deep onion flavor, but with weeknight ease.
  • The cheese gratin layer turns every spoonful into a molten, savory dream—honestly, it’s why I keep extra bread around for the leftovers.
02 -
  • Once I let the onions rush on too high a heat, and bitter, scorched bits crept in—medium is your friend, even if you’re in a hurry.
  • Letting the soup simmer uncovered for a few minutes brings out unexpected depth—don’t skip this, even if it means an extra couple of minutes.
03 -
  • Use oven-safe bowls with thick sides so they stand up to broiler heat—thin ones can crack.
  • A dash of sherry or splash of brandy in place of white wine brings a subtle twist.
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