Serious French Onion Soup
A classic, deeply caramelized onion soup with a golden, toasted cheese topping, requiring careful attention to avoid burning the onions. This french-inspired soups ready in about 95 minutes pairs yellow onions, unsalted butter, olive oil for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 380 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, thinly sliced (about 2 lbs) yellow onions
- 3 tbsp unsalted butter
- 2 tbsp olive oil
- 1 tsp sugar
- 1/2 cup dry white wine
- 4 cups beef broth
- 2 sprigs fresh thyme
- 2 bay leaves
- 1/2 tsp salt
- 1/4 tsp black pepper
- 4, cut into 1/2-inch thick pieces baguette slices
- 1 cup, grated Gruyère cheese
- 1/4 cup, grated Parmesan cheese
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Instructions
- Step 1: Melt 2 tbsp butter and 2 tbsp olive oil in a large heavy-bottomed pot over medium heat. Add the sliced onions and sugar, then cook for 40-50 minutes, stirring every 5 minutes, until the onions are deeply caramelized and golden brown — do not rush the process to avoid burning.
- Step 2: Pour in the dry white wine and stir to deglaze the pot, scraping up any browned bits. Simmer for 5 minutes until the wine has evaporated.
- Step 3: Add the beef broth, thyme, bay leaves, salt, and pepper. Bring to a simmer, then reduce heat to low and cover. Simmer for 30 minutes to meld the flavors.
- Step 4: Preheat the broiler. Place the baguette slices on a baking sheet and toast under the broiler for 2-3 minutes until golden on both sides.
- Step 5: Ladle the soup into oven-safe bowls, top each with a toasted baguette slice, then sprinkle generously with 1/2 cup Gruyère and 2 tbsp Parmesan. Broil for 2-3 minutes until the cheese is bubbly and golden.
Frequently asked questions
How long does Serious French Onion Soup take to make?
Total time is about 95 minutes (20 min prep + 75 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 Serious French Onion Soup?
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 Serious French Onion Soup?
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 Serious French Onion Soup 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 Serious French Onion Soup?
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
- ★★★★★
My partner, who's usually picky, absolutely loved this.
- ★★★★☆
Reliable weeknight option. Not going to blow your mind but always satisfying.
- ★★★★☆
Very good for a 75-minute recipe. Would bump up the spice level though.
