Layers of creamy potatoes, onions, Gruyère and cheddar baked to golden perfection in a comforting British pie.
# What You Need:
→ Vegetables
01 - 2.6 lbs floury potatoes (Maris Piper or Yukon Gold), peeled and thinly sliced
02 - 2 medium onions, thinly sliced
03 - 2 cloves garlic, minced
→ Dairy
04 - 5 oz Gruyère cheese, grated
05 - 5 oz mature cheddar cheese, grated
06 - 1 1/4 cups heavy cream
07 - 3.5 tablespoons unsalted butter
08 - 1/2 cup whole milk
→ Seasonings
09 - 1/2 teaspoon freshly grated nutmeg
10 - 1 teaspoon Dijon mustard
11 - Salt and freshly ground black pepper to taste
→ Topping
12 - 2 tablespoons fresh chives, finely chopped (optional)
# Step-by-step guide:
01 - Preheat the oven to 375°F. Butter an 8-cup ovenproof pie or casserole dish.
02 - In a large saucepan, melt the butter over medium heat. Add the onions and garlic, cooking for 6 to 8 minutes until soft and translucent but not browned. Remove from heat.
03 - In a bowl, combine the heavy cream, milk, Dijon mustard, nutmeg, salt, and pepper.
04 - Layer half the potato slices in the prepared dish, slightly overlapping. Top with half the onion mixture and sprinkle with half the Gruyère and cheddar.
05 - Repeat with remaining potatoes, onion mixture, and cheeses.
06 - Pour the cream mixture evenly over the layers. Press down gently with a spatula to compact.
07 - Cover the dish with aluminum foil and bake for 40 minutes.
08 - Remove the foil and bake for 20 minutes until golden and bubbling.
09 - Let rest for 10 minutes before serving. Garnish with chives if desired.