Baked Zucchini and Gruyere Gratin

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

A creamy, cheesy gratin made with thinly sliced zucchini, baked until golden and bubbly. This low-carb side dish is perfect for keto dinners. This mediterranean-inspired keto (low carb) ready in about 45 minutes pairs medium zucchini, grated Gruyere cheese, grated Parmesan cheese for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 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.

Prep: 15 min Cook: 30 min Serves 4 Mediterranean cuisine 320 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 375°F (190°C). Grease a 9x9 inch baking dish with 2 tbsp butter.
  2. Step 2: Slice 2 medium zucchinis into 1/4-inch thick rounds and arrange in a single layer in the dish.
  3. Step 3: Sprinkle 1/4 cup Gruyere cheese, 1/4 cup Parmesan cheese, 1 tsp dried thyme, and a pinch each of salt and pepper over the zucchini.
  4. Step 4: Whisk 1/4 cup heavy cream with the remaining 1/4 cup Gruyere cheese in a small bowl.
  5. Step 5: Pour the cream mixture evenly over the zucchini, then bake for 25-30 minutes until golden and bubbly around the edges.

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Frequently asked questions

How long does Baked Zucchini and Gruyere Gratin take to make?

Total time is about 45 minutes (15 min prep + 30 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 Zucchini and Gruyere Gratin?

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 medium zucchini from drying out.

Can I substitute ingredients in Baked Zucchini and Gruyere Gratin?

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 Zucchini and Gruyere Gratin 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 Zucchini and Gruyere Gratin low carb?

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

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