Savory Vegetable Gratin with Nutmeg

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

A layered gratin featuring seasonal vegetables slowly baked to golden perfection, embodying the thoughtful care required for a truly serious side dish. This french-inspired vegetarian ready in about 80 minutes pairs medium, thinly sliced potatoes, medium, thinly sliced zucchini, medium, thinly sliced red onion for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 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.

Prep: 30 min Cook: 50 min Serves 6 French cuisine 320 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F. In a saucepan, melt 3 tbsp unsalted butter over medium heat, then whisk in 2 tbsp all-purpose flour to form a roux, cooking for 1 minute until golden.
  2. Step 2: Gradually whisk in 1 cup whole milk while simmering for 4 minutes until thickened, then stir in 3 tbsp chopped fresh thyme, 1/4 tsp fresh nutmeg, and 1/2 tsp sea salt.
  3. Step 3: In a 9x13-inch baking dish, layer 1/3 of the 2 sliced potatoes, 1/3 of the sliced zucchini, and 1/3 of the sliced red onion, then pour 1/3 of the cheese sauce over the top. Repeat layers twice, ending with a final layer of cheese sauce.
  4. Step 4: Sprinkle 1 cup grated Gruyère and 1/2 cup grated Parmesan evenly over the surface, then bake uncovered for 50 minutes until bubbling and golden brown around the edges.

Frequently asked questions

How long does Savory Vegetable Gratin with Nutmeg take to make?

Total time is about 80 minutes (30 min prep + 50 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 Savory Vegetable Gratin with Nutmeg?

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 chopped fresh thyme from drying out.

Can I substitute ingredients in Savory Vegetable Gratin with Nutmeg?

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 Savory Vegetable Gratin with Nutmeg 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 Savory Vegetable Gratin with Nutmeg?

French vegetarian 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.

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