This Savory Herb Potato Casserole is a cozy, comforting dish that blends creamy layers of sliced potatoes with the aromatic flavors of thyme and rosemary. Perfect for a holiday gathering or a simple family dinner, it's a guaranteed crowd-pleaser.
Russet potatoes are the backbone of this dish, providing a starchy, fluffy texture that soaks up the creamy sauce. Onion and garlic add a savory depth, while heavy cream creates the rich, luscious sauce that ties everything together. Cheddar cheese and Parmesan cheese offer a sharp, tangy contrast to the creamy base. The fresh herbs, thyme and rosemary, lend a fragrant, earthy note that elevates the dish. Finally, a touch of butter ensures the onions and garlic cook to perfection, while salt and black pepper round out the seasoning.
This casserole pairs beautifully with roasted chicken or beef tenderloin. Add a side of steamed green beans or a crisp garden salad to balance the richness of the dish. It also makes a great brunch item, served alongside eggs and bacon.
Start by preheating your oven to 375°F (190°C). This ensures it's ready to go when your casserole is assembled. Take a large skillet and melt the butter over medium heat. Add the onions and garlic, sautéing them until they become translucent. This usually takes about 5 minutes and releases a wonderful aroma that's a good sign you're on the right track.
In a mixing bowl, combine the heavy cream, cheddar cheese, Parmesan cheese, thyme, rosemary, salt, and black pepper. Stir everything together until it's well mixed. This is the flavorful cream mixture that will bathe your potatoes in rich, cheesy goodness.
Now, grab a greased 9x13 inch baking dish and start layering. Lay down half of your thinly sliced potatoes evenly across the bottom. Then spread half of your onion and garlic mixture over them. Pour half of the cream mixture you prepared earlier over this layer. Repeat the process with the remaining potatoes, onion mixture, and cream mixture to create a second layer.
Cover the dish with aluminum foil and place it in the preheated oven. Let it bake for 45 minutes. This cooking time allows the potatoes to soften and the flavors to meld. After 45 minutes, remove the foil and continue baking for another 15 minutes to let the top crisp up to a delightful golden brown.
Once it's done, let the casserole cool slightly before serving. This resting time helps the layers set, making it easier to slice and serve.
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