Layers of creamy potatoes, onions, Gruyère and cheddar baked to golden perfection in a comforting British pie.
# What You'll 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)
# How-To Steps:
01 - Preheat oven to 375°F. Butter an 8-cup ovenproof pie or casserole dish and set aside.
02 - Melt butter in a large saucepan over medium heat. Add sliced onions and minced garlic, cooking 6-8 minutes until softened and translucent, avoiding browning. Remove from heat.
03 - In a mixing bowl, whisk together heavy cream, whole milk, Dijon mustard, nutmeg, salt, and pepper until thoroughly combined.
04 - Arrange half the potato slices in the prepared dish with slight overlap. Top with half the cooked onion mixture and sprinkle with half the combined Gruyère and cheddar cheeses.
05 - Layer remaining potato slices, followed by remaining onion mixture and cheese blend.
06 - Pour cream mixture evenly over all layers. Gently press down with a spatula to compact ingredients.
07 - Cover dish with aluminum foil and bake for 40 minutes at 375°F.
08 - Remove foil and bake for an additional 20 minutes until golden brown and bubbling at edges.
09 - Let rest for 10 minutes before serving. Garnish with fresh chives if desired.