Creamy Thyme Scalloped Potatoes with Gruyère

By AislePrompt Editorial · Published 2026-04-02 · Updated 2026-04-02

How this recipe was made — this recipe was drafted by AislePrompt's AI-assisted pipeline from technique templates and USDA-sourced nutrition data, and published by AislePrompt Editorial — see how AislePrompt recipes are developed and reviewed.

Silky potatoes layered in a rich cheese cream sauce, baked until bubbly and golden with fresh thyme for a decadent side dish. This French-inspired one-pot recipe, ready in about 65 minutes, pairs Yukon Gold potatoes, whole milk, heavy cream 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.

Prep: 20 min Cook: 45 min Serves 6 French cuisine 350 cal/serving

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Ingredients

2 lbs, peeled and thinly sliced 1/8-inch thick Yukon Gold potatoes
2 cups whole milk
1 cup heavy cream
1 cup, grated Gruyère cheese
1/2 cup, grated Parmesan cheese
3 tbsp unsalted butter
2 tbsp all-purpose flour
1 tbsp, leaves only fresh thyme
1/2 tsp salt
1/4 tsp black pepper
1/4 tsp (optional) nutmeg

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Instructions

Step 1: Preheat oven to 375°F (190°C). In a large saucepan, melt 3 tbsp unsalted butter over medium heat, then whisk in 2 tbsp all-purpose flour to form a roux, cooking for 1-2 minutes until golden.
Step 2: Gradually whisk in 2 cups whole milk and 1 cup heavy cream, then bring to a gentle simmer, stirring constantly until sauce thickens and coats the back of a spoon (about 5 minutes).
Step 3: Stir in 1 cup grated Gruyère, 1/2 cup grated Parmesan, 1 tbsp fresh thyme, 1/2 tsp salt, 1/4 tsp black pepper, and 1/4 tsp nutmeg (if using) until cheese melts and sauce is smooth.
Step 4: Arrange half of the sliced potatoes in a single layer in a greased 9x13-inch baking dish. Pour half of the cheese sauce over potatoes, then top with remaining potatoes and the rest of the sauce.
Step 5: Cover with foil and bake for 30 minutes. Remove foil and bake 15 more minutes until potatoes are tender and top is golden and bubbly.