Three Cheese Potato Gratin

Ingredients

• Butter, for greasing the baking dish
• 2 tablespoons extra-virgin olive oil
• 1 large onion, chopped
• 2 large cloves garlic, chopped
• 1/3 cup heavy whipping cream
• 1/4 cup low-sodium chicken broth
• 1 teaspoon minced fresh rosemary
• 1 teaspoon coarse kosher salt
• 3/4 teaspoon freshly ground black pepper
• 5 small Yukon gold potatoes, peeled, cut into 1/8-inch-thick rounds (about 1 1/4 pounds)
• 1 large yam (red skinned sweet potatoes), cut into 1/8-inch to 1/4-inch-thick rounds
• 1 1/2 cups coarsely grated Gruyere cheese (about 5 ounces)
• 1/2 cup coarsely grated Asiago cheese (about 1 1/2 ounces)
• 1/2 cup finely grated Pecorino Romano cheese (about 1 1/2 ounces)
• 2 tablespoons chopped fresh flat-leaf parsley, optional

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