Method

• Preheat your oven to 375°F (190°C) to prepare for baking the gratin. Get that oven nice and hot!
• In a large pot, boil the sliced sweet potatoes until they are tender, which should take about 10-15 minutes.
• Drain the cooked sweet potatoes and place half of them evenly in a greased baking dish to form the first layer.
• Sprinkle half of the fresh cranberries evenly over the sweet potato layer.
• In a bowl, combine heavy cream, brown sugar, cinnamon, salt, and pepper. Pour half of this mixture evenly over the sweet potato and cranberry layers.
• Add the remaining sweet potatoes and cranberries in another layer and pour the rest of the cream mixture on top.
• Sprinkle shredded Gruyère cheese and breadcrumbs evenly on top.
• Place the gratin in the preheated oven and bake for 30-35 minutes, or until the top is golden brown and bubbly.
• Remove from oven and let it cool for a few minutes before serving.