Best Scalloped Potatoes

1. Preheat the Oven:
   Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with butter or non-stick spray.
2. Prepare the Potatoes:
   Peel the potatoes and slice them thinly (about 1/8-inch thick) using a mandolin or a sharp knife. Place them in a bowl of cold water to prevent browning.
3. Cook the Onion and Garlic:
   In a medium saucepan, melt the butter over medium heat. Add the chopped onion and cook for 3-4 minutes until softened. Add the minced garlic and cook for another 1-2 minutes until fragrant.
4. Make the Cream Sauce:
   Add the heavy cream and milk to the saucepan with the onions and garlic. Stir in the salt, pepper, thyme, and nutmeg (if using). Bring the mixture to a simmer over medium heat, then reduce the heat and let it simmer for about 5 minutes, stirring occasionally.
5. Layer the Potatoes:
   Remove the potato slices from the water and pat them dry with a clean towel. Arrange a layer of potatoes in the bottom of the prepared baking dish. Pour a portion of the cream mixture over the potatoes. Sprinkle with some of the shredded cheddar and Parmesan cheeses. Repeat this process, layering the potatoes, pouring the cream mixture, and adding cheese, until all the ingredients are used up. Finish with a final layer of cheese on top.
6. Bake the Scalloped Potatoes:
   Cover the baking dish with aluminum foil and bake in the preheated oven for 45 minutes. After 45 minutes, remove the foil and continue baking for an additional 25-30 minutes, or until the potatoes are tender and the top is golden and bubbly.
7. Let It Rest:
   Once the scalloped potatoes are done baking, remove them from the oven and let them sit for about 10 minutes before serving. This helps the sauce thicken and makes for easier slicing.
8. Garnish and Serve:
   Garnish with fresh parsley (optional) for a pop of color and serve.

Tips for the Best Scalloped Potatoes:

• Use starchy potatoes: Russet potatoes work best because they break down slightly during baking, creating a creamy texture.
• Slice potatoes evenly: For uniform cooking, slice the potatoes evenly, either by hand or with a mandolin.
• Make ahead: You can assemble the dish a day ahead and refrigerate it, then bake it when you’re ready to serve. If baking from the fridge, you may need to add an extra 10-15 minutes of cooking time.
• Cheese options: Feel free to mix and match cheeses. Gruyère, gouda, or mozzarella can add even more depth to the flavor.

Enjoy your creamy, cheesy scalloped potatoes—they’re sure to be a hit at your next meal!