Potato Gratin with Beer Cheese Sauce Recipe
This Potato Gratin with Beer Cheese Sauce is a rich and comforting layered casserole featuring thinly sliced Yukon gold potatoes baked in a creamy, flavorful beer-infused cheese sauce. Layers of tender potatoes, caramelized onions, and a blend of Gruyere, smoked Gouda, and Parmesan cheese create a decadent side dish perfect for gatherings and special meals. The dish is finished with a golden browned top and a hint of fresh thyme for added aroma.
- Prep Time: 30 minutes
- Cook Time: 1 hour 20 minutes
- Total Time: 1 hour 50 minutes
- Yield: 10 servings
- Category: Side Dish
- Method: Baking
- Cuisine: American
Ingredients
Beer Cheese Sauce
- 12 ounces beer (your favorite variety)
- 1 tablespoon fresh thyme leaves (minced)
- 2 small bay leaves
- 1 cup heavy cream
- 2 tablespoons all-purpose flour
- 1 large egg
- 5 cloves garlic (minced, or to taste)
Potato Layers
- 3 pounds Yukon gold potatoes (scrubbed and thinly sliced)
- 1 large onion (thinly sliced)
- 1½ teaspoon salt (divided)
- 1 teaspoon freshly cracked black pepper
Cheese
- 2½ cups shredded Gruyere cheese
- 2½ cups shredded smoked Gouda cheese
- 1 cup grated Parmesan cheese
Other
- 1 tablespoon olive oil (to brush on the bottom and up the sides of the baking dish)
Instructions
- Preheat oven and prepare dish: Preheat your oven to 425°F (220°C). Brush a 13 x 9-inch baking dish liberally with olive oil on the bottom and up the sides to prevent sticking, then set aside.
- Make the beer cheese sauce: In a small saucepan over medium heat, bring the beer, minced fresh thyme, and bay leaves to a simmer. Reduce heat to medium-low, simmering gently. In a separate small bowl, whisk together the heavy cream, flour, egg, and minced garlic until smooth. Stir this cream mixture into the simmering beer mixture and cook, stirring occasionally to prevent burning, until the sauce thickens, about 15 minutes. Remove from heat, discard bay leaves, and let cool slightly while you assemble the dish.
- Layer the potatoes: Begin assembling the gratin by overlapping half the thinly sliced potatoes evenly on the bottom of the prepared baking dish. Sprinkle half the salt and pepper over this layer.
- Add onions and sauce: Distribute the thinly sliced onions evenly over the potato layer. Pour half of the beer cheese sauce over the onions and potatoes, gently shaking the dish to ensure it is evenly coated.
- Add cheese: Sprinkle half of the combined shredded Gruyere and smoked Gouda cheeses evenly over the first layer.
- Repeat layering: Repeat the layering process with the remaining potatoes, salt, pepper, onions (if any remaining), the rest of the beer cheese sauce, and the remaining shredded Gruyere and smoked Gouda cheese. Finish by sprinkling the grated Parmesan cheese evenly on top.
- First bake: Cover the baking dish with foil or a lid and bake in the preheated 425°F oven for 40 minutes to start cooking the potatoes and melt the cheese.
- Second bake uncovered: Remove the cover, reduce the oven temperature to 350°F (175°C), and continue baking uncovered for another 40 minutes. This will brown the cheese on top and ensure the potatoes are tender when pierced with a fork.
- Rest and serve: Remove the gratin from the oven and allow it to cool for at least 20 minutes to let it set. Garnish with fresh thyme sprigs if desired before serving.
Notes
- For best results, slice potatoes as thinly and evenly as possible to ensure even cooking.
- You can use any variety of beer you like, but a lighter or amber ale pairs well with the cheese flavors.
- This dish can be prepared ahead of time and baked just before serving.
- Resting the gratin after baking allows the sauce to thicken and makes serving easier.
- Feel free to swap smoked Gouda with other flavorful cheeses like cheddar or fontina for variation.
