Instructions
- Preheat oven to 375°F (190°C). Grease a 9x13 inch baking dish.
- Arrange Potato slices in the prepared baking dish, slightly overlapping.
- In a large saucepan, melt Butter from Cream Sauce ingredients over medium heat. Whisk in Flour and cook for 1-2 minutes, creating a roux.
- Gradually whisk in Milk and Heavy Cream until smooth. Bring to a simmer, stirring constantly, until thickened, about 5-7 minutes.
- Remove from heat and stir in Cheddar Cheese, Gruyere Cheese, Nutmeg, Salt, and Pepper until cheese is melted and sauce is smooth.
- Pour the Cream Sauce evenly over the Potato slices.
- In a small bowl, combine Panko Bread Crumbs, Melted Butter, and Parmesan Cheese from Topping ingredients. Sprinkle over the potatoes.
- Cover with foil and bake for 30 minutes. Remove foil and bake for another 15-20 minutes, or until bubbly and golden brown.
