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Instructions:
- Preheat the oven to 375°F (190°C) and generously butter a deep baking dish.
- In a saucepan over medium heat, melt the butter and sauté the garlic for about 30 seconds until fragrant.
- Stir in the heavy cream, milk, salt, black pepper, white pepper if using, and paprika. Heat until warm but do not boil.
- Arrange half of the sliced potatoes evenly in the prepared baking dish.
- Pour half of the warm cream mixture over the potatoes.
- Sprinkle with half of the shredded cheeses.
- Repeat with the remaining potatoes, cream mixture, and cheeses.
- Cover loosely with foil and bake for 40 minutes.
- Remove the foil and continue baking for 20 minutes until the casserole is bubbling and golden on top.
- Let rest for 10 minutes before serving. Garnish with fresh parsley or chives.
Variations
- Add cooked bacon or caramelized onions between layers for extra flavor.
- Substitute Gruyère for part of the cheddar for a more nutty profile.
- Add a pinch of nutmeg for a classic steakhouse touch.
- Use Yukon Gold potatoes for a slightly creamier texture.
Tips
- Slice potatoes evenly using a mandoline for uniform cooking.
- Always use freshly shredded cheese for the smoothest melt.
- Do not boil the cream mixture, as this can cause curdling.
- Let the casserole rest before serving to ensure the sauce thickens properly.