Slow-Simmered French Onion Soup with Crispy Gruyère
Rich, caramelized onion soup simmered with thyme and beef broth, topped with melted Gruyère cheese for a classic comfort food experience. This french-inspired soups ready in about 60 minutes pairs large onions, butter, dried thyme for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 350 calories and feeds 6, 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 onions
- 4 tbsp butter
- 1 tsp dried thyme
- 1 bay leaf
- 4 cups beef broth
- 1 slice baguette
- 1 cup Gruyère cheese
Instructions
- Step 1: Melt 4 tbsp butter in a large pot over medium heat. Add 4 thinly sliced large onions and cook, stirring occasionally, for 30-40 minutes until deeply golden brown and caramelized (reduce heat to low if browning too quickly).
- Step 2: Stir in 1 tsp dried thyme and 1 bay leaf, then pour in 4 cups beef broth. Bring to a gentle simmer and cook uncovered for 20 minutes, stirring occasionally to meld flavors.
- Step 3: Ladle soup into oven-safe bowls, top each with a slice of baguette, and sprinkle 1/4 cup shredded Gruyère cheese over the bread. Broil on high for 2-3 minutes until the cheese is melted and bubbly with golden spots.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Slow-Simmered French Onion Soup with Crispy Gruyère take to make?
Total time is about 60 minutes (20 min prep + 40 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-Simmered French Onion Soup with Crispy 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 large onions from drying out.
Can I substitute ingredients in Slow-Simmered French Onion Soup with Crispy 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 Slow-Simmered French Onion Soup with Crispy Gruyère for a different number of people?
The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). 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-Simmered French Onion Soup with Crispy 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.
What others are saying
- ★★★★★
This soup is a revelation! The onions caramelized perfectly and the Gruyère topping was just right.
- ★★★★★
My family devoured every bowl. The slow-simmer method really brings out the sweetness.
- ★★★★☆
Loved the flavor, but it was slightly bland for my taste. Next time I'll add a splash of sherry.
