Preheat the Oven: Preheat your oven to 375°F (190°C). Grease a baking dish with butter or cooking spray and set aside.
Prepare the Potatoes: Wash and peel the potatoes if desired. Slice them thinly using a mandoline or a sharp knife. Pat the slices dry with a paper towel.
Create the Creamy Mixture: In a saucepan, melt the butter over medium heat. Add the minced garlic and sauté for about a minute until fragrant. Pour in the heavy cream and bring it to a gentle simmer. Stir in half of the grated Gruyère and Parmesan cheese until they melt and create a creamy mixture. Season with salt, pepper, and thyme leaves.
Layer the Potatoes: Start by arranging a layer of potato slices in the greased baking dish, slightly overlapping them. Pour a portion of the creamy mixture over the potatoes, ensuring they’re coated evenly. Repeat this process, alternating layers of potatoes and creamy mixture, until you’ve used up all the ingredients. Press down gently to ensure the layers are compact.
Bake to Perfection: Cover the baking dish with aluminum foil and place it in the preheated oven. Bake for about 40 minutes. Then, remove the foil and sprinkle the remaining grated cheese over the top of the dish. Continue baking for another 20-25 minutes or until the potatoes are tender and the top is golden brown and bubbly.
Serve and Garnish: Once the French Potato Au Gratin is done baking, remove it from the oven and let it cool slightly. Garnish with chopped fresh parsley for a burst of color and freshness.
Enjoy the Creamy Delight: Slice and serve the French Potato Au Gratin while it’s still warm. The layers of tender potatoes enveloped in the creamy, cheesy sauce are sure to make every bite a comforting delight.
This French Potato Au Gratin is a timeless classic that’s perfect for serving 6 people. The rich flavors and indulgent creaminess make it a favorite among potato lovers. Bon appétit!