Baked Ratatouille Gratin with Parmesan and Fresh Basil

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

Layers of tender zucchini, eggplant, and tomatoes baked in a fragrant herb sauce, topped with golden Parmesan and fresh basil for a comforting vegetable gratin. This french-inspired vegetarian ready in about 65 minutes pairs zucchini, eggplant, tomatoes for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 180 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.

★ 4.5 (10 ratings) Prep: 20 min Cook: 45 min Serves 4 French cuisine 180 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F (190°C). In a small bowl, combine 3 tbsp olive oil, 3 minced garlic cloves, 1 tsp chopped fresh thyme, 1 tsp salt, and 1/2 tsp black pepper.
  2. Step 2: Lightly grease a 9-inch round baking dish with 1 tbsp of the garlic-herb olive oil mixture.
  3. Step 3: Arrange alternating slices of 1 medium zucchini, 1 small eggplant, and 3 medium tomatoes vertically and overlapping in the dish to form a circular pattern.
  4. Step 4: Drizzle the remaining 2 tbsp of garlic-herb olive oil evenly over the arranged vegetables.
  5. Step 5: Cover the dish with foil and bake for 30 minutes until vegetables are tender.
  6. Step 6: Remove foil, sprinkle 1/2 cup grated Parmesan cheese over the top, and bake uncovered for another 10-15 minutes until cheese is golden and bubbling.
  7. Step 7: Garnish with 1/4 cup chopped fresh basil before serving warm.

Frequently asked questions

How long does Baked Ratatouille Gratin with Parmesan and Fresh Basil take to make?

Total time is about 65 minutes (20 min prep + 45 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 Baked Ratatouille Gratin with Parmesan and Fresh Basil?

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 zucchini from drying out.

Can I substitute ingredients in Baked Ratatouille Gratin with Parmesan and Fresh Basil?

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 Baked Ratatouille Gratin with Parmesan and Fresh Basil 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.

Is Baked Ratatouille Gratin with Parmesan and Fresh Basil vegetarian?

Yes — this recipe is tagged vegetarian based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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