Ingredients
Method
- Preheat oven to 375°F. Grease a 9x13-inch baking dish.
- Sauté leeks in butter over medium heat until soft, about 6–8 minutes. Add garlic and cook 30 seconds.
- Whisk milk, cream, eggs, salt, pepper, and thyme in a bowl.
- Toss thawed hashbrowns, cooked leeks, Gruyère, and Parmesan in a large bowl. Pour in milk mixture and stir gently.
- Spread mixture in the prepared dish. Sprinkle panko evenly on top.
- Bake 40–45 minutes until set and golden. Let rest 10 minutes before serving.