Ingredients
Main Ingredients
- 2.5 lb Yukon Gold potatoes peeled and sliced 1/8-inch thick
- 1.5 cups sharp cheddar cheese freshly grated
- 1 cup Gruyère cheese freshly grated
- 0.5 cup Parmesan cheese freshly grated, reserved for topping
Cream Sauce
- 3 tbsp butter
- 1 sweet onion finely diced
- 3 cloves garlic minced
- 3 tbsp all-purpose flour
- 1.5 cups heavy cream warmed
- 0.5 cup whole milk warmed
- 0.25 cup chicken broth warmed
- 1.5 tsp sea salt
- 0.75 tsp black pepper freshly ground
- 2 tsp fresh thyme leaves only
- 1/8 tsp nutmeg
Equipment
Method
- Preheat oven to 350°F (175°C). Butter a 9x13 ceramic baking dish generously.
- Peel and thinly slice the potatoes using a mandoline (1/8-inch thick).
- Grate the cheeses. Mix cheddar and Gruyère together in one bowl, reserve Parmesan separately.
- In a heavy-bottomed saucepan, melt butter over medium heat until foamy.
- Add onion and cook until translucent, about 5 minutes. Add garlic and sauté for 30 seconds.
- Whisk in flour and cook for 1–2 minutes until a golden roux forms.
- Gradually whisk in the warm cream, milk, and broth until smooth.
- Stir in salt, pepper, thyme, and nutmeg. Simmer until thickened, about 3–4 minutes.
- Remove from heat and stir in 1/2 cup of the cheddar-Gruyère mixture to melt into the sauce.
- Spread a thin layer of sauce on the bottom of the baking dish.
- Layer one-third of the potato slices, followed by one-third of the sauce and cheese mixture. Repeat twice more.
- Top with remaining cheese mixture and the reserved Parmesan.
- Cover with foil and bake for 45 minutes.
- Remove foil and bake uncovered for an additional 25–30 minutes until golden and bubbling.
- Let rest for 15 minutes before serving to allow the sauce to set.
Nutrition
Calories: 420kcalCarbohydrates: 28gProtein: 13g
Notes
Make ahead: Assemble up to 24 hours in advance and refrigerate. Add 15 minutes to baking time if cold.
Variations: Add diced ham, crispy bacon, or fresh herbs like parsley and chives for different twists.
Serving ideas: Pairs well with ham, roast chicken, steak, or a fresh salad.
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