Apple Sweet Potato Gratin - Oryana

Ingredients

• 7 tablespoons cold butter
• 1 1⁄2 pounds apples, (about 5) peeled, cored, quartered, and sliced 1⁄4-inch thick
• 1 cup half and half
• 2 teaspoons salt
• 1 teaspoon white pepper
• 1⁄2 teaspoon cinnamon
• Big pinch ground nutmeg
• 2 1⁄2 pounds sweet potatoes, peeled, cut into 1⁄4-inch-thick rounds
• 1⁄2 cup panko or fresh bread crumbs
• 1/2-inch cubes of the remaining butter