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Cheesy Potato Gratin Casserole

Golden, cheesy layers of tender potatoes baked with cream, garlic, and three cheeses, making the perfect comforting side dish.
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Prep Time 20 minutes
Cook Time 1 hour 10 minutes
Total Time 1 hour 30 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American, French
Calories: 380
Ingredients Equipment Method Notes

Ingredients
  

  • 3 lbs russet potatoes peeled and thinly sliced
  • 2 cups heavy cream
  • 1 cup whole milk
  • 3 tbsp unsalted butter
  • 3 cloves garlic minced
  • 1 tsp salt
  • 0.5 tsp black pepper
  • 0.5 tsp nutmeg optional
  • 2 cups shredded Gruyère cheese
  • 1 cup shredded sharp cheddar cheese
  • 0.5 cup grated Parmesan cheese
  • 2 tbsp fresh parsley chopped, for garnish

Equipment

  • Casserole dish
  • Saucepan
  • Mandoline slicer
  • Aluminum foil

Method
 

  1. Preheat oven to 375°F (190°C). Grease a 9x13-inch casserole dish.
  2. In a saucepan, melt butter and sauté garlic for 1–2 minutes. Stir in cream, milk, salt, pepper, and nutmeg. Simmer 3–4 minutes, then remove from heat.
  3. Arrange half of the potato slices in the dish. Pour half of the cream mixture and sprinkle with half of the cheeses.
  4. Repeat with remaining potatoes, cream mixture, and cheeses.
  5. Cover with foil and bake 40 minutes. Remove foil and bake 25–30 minutes until golden and bubbly.
  6. Rest for 10 minutes before serving. Garnish with parsley.

Notes

For extra crispiness, broil for 2–3 minutes after baking. Assemble ahead and refrigerate up to 24 hours before baking.