
Indulge in the ultimate comfort food with these thinly sliced potatoes layered in a rich, garlic-infused cream sauce and topped with melted Gruyère cheese. This French classic is baked until tender and golden, making it the perfect side dish for holiday feasts or Sunday roasts.
In a large jug or mixing bowl, whisk together the heavy cream, minced garlic, and melted butter until well combined.
Preheat your oven to 180°C (350°F). Lightly grease a deep baking dish with a small amount of butter to prevent sticking.
Peel the starchy potatoes and slice them into thin rounds, approximately 3mm (1/8 inch) thick. Using a mandoline slicer is recommended for perfectly even slices.
Create the first layer: Spread one-third of the potato slices across the bottom of the baking dish. Pour over one-third of the cream mixture, then scatter with one-third of the salt, pepper, and thyme. Sprinkle with 3/4 cup of the grated Gruyère cheese.
Repeat the layering process for the second layer. For the third and final layer, add the remaining potatoes and pour over the rest of the cream mixture, but do not add cheese yet.
Cover the dish tightly with a lid or aluminum foil. Bake for 75 to 90 minutes, or until the potatoes in the center are completely soft when tested with a knife.
Remove the foil and sprinkle the remaining Gruyère cheese over the top. Bake uncovered for an additional 10 to 15 minutes until the top is bubbly and golden brown. Let the dish stand for 5 minutes before serving to allow the sauce to set.
For the best texture, use starchy potatoes like Russets or Maris Pipers as they absorb the cream beautifully. If Gruyère is unavailable, sharp white cheddar or Emmental are excellent substitutes. Ensure you use full-fat heavy cream to prevent the sauce from curdling during the long bake time.




