Ingredients
- 1 tablespoon butter, for the baking dish
- 2 tablespoons unsalted butter
- 1 cup panko breadcrumbs
- 1 1/2 cups (6 ounces) grated Gruyere cheese , divided
- 2 1/2 cups heavy cream
- 1/2 cup milk
- 3 sprigs thyme
- 3 pounds Y ukon Gold potatoes, peeled and sliced 1/8 inch thick (see Recipe Note)
- 1 medium yellow onion, cut into 1/8-inch thick slices
- 1 teaspoon salt
- 1/8 teaspoon ground black pepper
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