These Gruyère Scalloped Potatoes with Garlic & Thyme are a rich, creamy holiday side dish made with thinly sliced potatoes layered in garlic-infused cream and plenty of nutty Gruyère cheese.
The potatoes slowly bake until tender while absorbing the creamy sauce, and the top develops a beautifully golden, bubbling cheese crust.
Fresh thyme and garlic keep the dish savory and aromatic without overwhelming the delicate potato flavor.
They are especially good for Thanksgiving, Christmas, family gatherings, or any dinner where you want an impressive potato side that can be prepared ahead.
Why You Will Love This Recipe
- Gruyère melts beautifully and adds a rich, nutty flavor.
- Thin potato slices create soft, creamy layers.
- Garlic and thyme give the sauce classic savory flavor.
- The top becomes golden and slightly crisp.
- It pairs beautifully with turkey, chicken, or roasted vegetables.
- The casserole can be assembled ahead.
- It looks elegant enough for a holiday table.
- Leftovers reheat extremely well.
Ingredients
For the Potatoes:
- 3 lb Yukon Gold potatoes
- 2 tablespoons unsalted butter, softened for the baking dish
- 1½ cups shredded Gruyère cheese
- ½ cup freshly grated Parmesan cheese
- Fresh thyme for finishing
- Freshly ground black pepper
For the Garlic Thyme Cream:
- 2 cups heavy cream
- 1 cup whole milk
- 4 garlic cloves, finely minced
- 1 tablespoon fresh thyme leaves
- 1 teaspoon salt
- ½ teaspoon freshly ground black pepper
- ¼ teaspoon ground nutmeg
- 1 tablespoon unsalted butter
🍳 Step-by-Step Masterclass Instructions
Step 1: Preheat the Oven
Preheat your oven to 375°F (190°C).
Generously butter a 9 × 13-inch baking dish, including the sides and corners.
Step 2: Prepare the Potatoes
Peel the potatoes if desired.
Using a mandoline or very sharp knife, slice them approximately ⅛ inch thick.
Try to keep every slice approximately the same thickness.
Masterclass Tip: Consistent slices are one of the secrets to scalloped potatoes. Thick and thin slices mixed together will cook unevenly.
Step 3: Do Not Rinse the Potatoes
Once sliced, keep the potatoes as they are.
Do not rinse them under water.
The natural starch on the potato slices helps thicken the cream sauce while the casserole bakes.
Step 4: Prepare the Garlic Cream
Add the heavy cream, milk, garlic, thyme, salt, black pepper, nutmeg, and butter to a medium saucepan.
Warm over medium-low heat for approximately 4–5 minutes.
The mixture should become hot and fragrant but should not boil vigorously.
Step 5: Start the First Potato Layer
Arrange approximately one-third of the sliced potatoes across the bottom of the buttered baking dish.
Slightly overlap each slice.
Season very lightly with black pepper.
Step 6: Add the Cheese
Scatter approximately one-third of the Gruyère over the potatoes.
Add a small amount of Parmesan.
Pour about one-third of the warm garlic cream evenly over the layer.
Step 7: Repeat the Layers
Add another layer of overlapping potatoes.
Top with more Gruyère, Parmesan, and garlic cream.
Repeat once more with the remaining potatoes.
Masterclass Tip: Pouring some cream between every layer gives you a more evenly creamy casserole than pouring all of it over the top.
Step 8: Finish the Top
Pour the remaining cream over the potatoes.
Press gently with a spatula so most of the potatoes come into contact with the liquid.
Sprinkle the remaining Gruyère and Parmesan generously over the surface.
Step 9: Cover and Bake
Cover the baking dish tightly with foil.
Bake for approximately 45 minutes.
The trapped steam helps soften the potato layers without drying out the surface.
Step 10: Check the Potatoes
Carefully remove the foil.
Insert a thin knife into the center of the casserole.
The potatoes should be beginning to soften but may still offer slight resistance.
Step 11: Bake Uncovered
Return the casserole to the oven without the foil.
Bake for another 30–40 minutes.
The cream should bubble gently around the edges and the cheese should become golden brown.
Step 12: Test for Doneness
Insert a knife through the center again.
It should slide through the potato layers with almost no resistance.
If the potatoes are still firm, bake for another 10 minutes and check again.
Step 13: Create a Golden Top
For extra color, turn the oven to broil for approximately 1–3 minutes.
Watch constantly.
The Gruyère should develop small golden-brown spots without burning.
Step 14: Rest Before Serving
Remove the casserole from the oven.
Let it rest for 15–20 minutes.
Masterclass Tip: This resting time is important. It allows the cream sauce to thicken and settle between the potato layers, making the casserole much easier to serve.
Step 15: Garnish and Serve
Finish with fresh thyme leaves and cracked black pepper.
Cut or spoon into portions.
The finished scalloped potatoes should have distinct tender layers, rich garlic-thyme cream, nutty melted Gruyère, and a deeply golden cheesy top.
🔒 Storage & Reheating Tips
Refrigerator: Store cooled scalloped potatoes tightly covered or in an airtight container for up to 4 days.
Oven reheating: Cover loosely with foil and reheat at 350°F (175°C) for 20–25 minutes. Remove the foil for the final 5 minutes to refresh the golden top.
Microwave: Reheat individual portions in short intervals until hot. The texture will remain creamy, although the top will be softer.
Make ahead: Assemble the casserole up to 1 day ahead, cover tightly, and refrigerate. Let it sit at room temperature for about 20–30 minutes before baking.
Best holiday method: You can also bake the casserole almost completely earlier in the day, refrigerate after cooling, then reheat and brown the cheese shortly before dinner.
Freezer: Freezing is possible for up to 1 month, but the cream sauce may become slightly grainier after thawing. Refrigerated make-ahead preparation gives better results.
Important reheating tip: If the potatoes look slightly dry before reheating, drizzle a few tablespoons of cream or milk around the edges before covering with foil.
