Classic French Onion Soup with Gruyère

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A timeless French bistro staple where deeply caramelized onions simmer in rich beef broth, crowned with melted Gruyère and toasted baguette. This french-inspired soups ready in about 90 minutes pairs yellow onions, butter, olive oil for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 420 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

★ 4.3 (13 ratings) Prep: 20 min Cook: 70 min Serves 4 French cuisine 420 cal/serving
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Ingredients

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Instructions

  1. Step 1: Thinly slice 1.5 lbs yellow onions. Melt 2 tbsp butter with 1 tbsp olive oil in a large pot over medium heat. Add onions and cook slowly for 50 minutes, stirring every 5 minutes, until deeply golden brown and caramelized.
  2. Step 2: Add 1/2 cup dry white wine to deglaze the pot, scraping up browned bits, and simmer for 5 minutes until wine evaporates.
  3. Step 3: Stir in 4 cups beef broth, 1/2 tsp thyme, and 2 bay leaves. Bring to a gentle simmer and cook uncovered for 20 minutes.
  4. Step 4: Preheat broiler. Ladle soup into oven-safe bowls, top each with a baguette slice, and sprinkle 1/4 cup grated Gruyère over each.
  5. Step 5: Broil 3-4 inches from heat for 2-3 minutes until cheese is golden and bubbly, watching closely to prevent burning.

Frequently asked questions

How long does Classic French Onion Soup with Gruyère take to make?

Total time is about 90 minutes (20 min prep + 70 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Classic French Onion Soup with Gruyère?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep yellow onions from drying out.

Can I substitute ingredients in Classic French Onion Soup with Gruyère?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Classic French Onion Soup with Gruyère for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Classic French Onion Soup with Gruyère?

French soups like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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