Slow-Cooked French Onion Soup with Gruyere
A deeply savory soup with caramelized onions, rich broth, and melted Gruyere cheese, perfect for a cozy evening. This french-inspired soups ready in about 80 minutes pairs large yellow onion, butter, all-purpose flour for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 350 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.
Ingredients
- 4 large yellow onion
- 3 tbsp butter
- 2 tbsp all-purpose flour
- 4 cups chicken broth
- 1/2 cup dry white wine
- 2 thyme sprigs
- 1 bay leaf
- 1/2 cup, grated Gruyere cheese
- 1 slice, toasted baguette
Instructions
- Step 1: Melt 3 tbsp butter in a large Dutch oven over medium heat. Add 4 large chopped yellow onions and cook for 45 minutes, stirring occasionally, until deeply golden and caramelized.
- Step 2: Stir in 2 tbsp all-purpose flour and cook for 1 minute to form a roux.
- Step 3: Pour in 1/2 cup dry white wine and simmer for 5 minutes until reduced by half.
- Step 4: Add 4 cups chicken broth, 2 thyme sprigs, and 1 bay leaf. Bring to a gentle simmer and cook uncovered for 30 minutes.
- Step 5: Remove thyme and bay leaf. Season with salt and pepper to taste.
- Step 6: Ladle soup into oven-safe bowls. Sprinkle 1/2 cup grated Gruyere over each bowl and top with 1 slice toasted baguette.
- Step 7: Broil for 2-3 minutes until cheese is bubbly and golden.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Slow-Cooked French Onion Soup with Gruyere take to make?
Total time is about 80 minutes (20 min prep + 60 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 Slow-Cooked French Onion Soup with Gruyere?
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 large yellow onion from drying out.
Can I substitute ingredients in Slow-Cooked French Onion Soup with Gruyere?
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 Slow-Cooked French Onion Soup with Gruyere 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 Slow-Cooked French Onion Soup with Gruyere?
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.
What others are saying
- ★★★★★
Loved the depth of flavor! Made it for my family and they were impressed.
- ★★★★★
Perfect for a cold evening. The onions were caramelized just right.
- ★★★★☆
Tasted great but the soup was a bit bland without salt. Next time I'll add more seasoning.
