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### **Step 1: Prepare the Aubergines**
1. Preheat your oven to **375°F (190°C)**.
2. Slice the **aubergines** into ½-inch thick rounds. Lay them out in a single layer on a baking sheet and drizzle with **olive oil**. Season with **salt** and **pepper**.
3. Roast the aubergines in the oven for **20-25 minutes**, flipping halfway through until they are tender and slightly golden. This step helps to soften the aubergines and bring out their natural sweetness.
### **Step 2: Make the Creamy Sauce**
1. While the aubergines are roasting, heat **olive oil** in a small saucepan over medium heat. Add the minced **garlic** and sauté for **1-2 minutes** until fragrant.
2. Add the **heavy cream** and **dried thyme** to the saucepan, stirring to combine. Bring the cream to a gentle simmer and let it cook for about **5 minutes** to thicken slightly.
3. Season the sauce with **salt** and **pepper** to taste, and remove from heat once it has reached a creamy consistency.
### **Step 4: Assemble the Gratin**
1. In a large baking dish, spread a thin layer of the **tomato sauce** (if using) on the bottom.
2. Layer the roasted **aubergine slices** on top, overlapping them slightly.
3. Pour the **creamy sauce** over the aubergines, ensuring they are well covered.
4. Sprinkle the top with the **grated cheese** and **breadcrumbs** for a golden, crispy topping.
### **Step 5: Bake the Gratin**
1. Bake the gratin in the preheated oven for **20-25 minutes**, or until the top is golden and bubbly.
2. Remove from the oven and let it sit for **5 minutes** before serving. This allows the flavors to meld together perfectly.
## **Tips for the Perfect Aubergines au Gratin**
🍆 **Use Firm Aubergines** – Choose aubergines that are firm to the touch with smooth skin to ensure they cook evenly and don’t become mushy.
🧀 **Cheese Choices** – Gruyère adds a nutty flavor, but you can also use a sharp cheddar or a mix of cheeses for different textures and tastes.
🍅 **Add Layers of Flavor** – If you like your gratin with a bit of acidity, the optional tomato sauce brings a lovely balance to the richness of the cream and cheese.
🥄 **Make Ahead** – You can prepare this dish ahead of time and refrigerate it. When you’re ready to eat, just bake it until the cheese is bubbly and golden.
Don’t forget to save this recipe for your next meal—this Aubergines au Gratin is a classic that will never go out of style. Enjoy!