Onion Potato Gratin Recipe

Ingredients

• 1 1/2 pounds Yukon Gold potatoes, peeled, cut into 1/4 inch thick slices
• 1 large yellow onion, thinly sliced
• 2 tablespoons unsalted butter
• Salt
• 2 teaspoons Herbes de Provence, or dried thyme
• 1/2 teaspoon white pepper
• 1/2 teaspoon nutmeg
• 1 cup (packed) grated Gruyere cheese (about 4 ounces)
• 8 tablespoons (packed) freshly grated Parmesan cheese (about 2 oounces)
• 2/3 cup half and half (half cream, half milk)