Creamy Mashed Sweet Potatoes

4 TBSP unsalted butter, cut into 4 pieces
3 TBSP heavy cream
Salt and pepper
1 tsp sugar
2 pounds sweet potatoes (2 large or 3 medium) peeled, quartered lengthwise, and cut into ¼ inch thick slices.
1. Combine butter, 2 TBSP cream, ½ tsp salt, ¼ tsp pepper, sugar and sweet potatoes in large saucepan. Cook, covered, over low heat until potatoes are fall apart tender, 35-40 minutes.
2. Off heat, add remaining tablespoon cream and mash sweet potatoes with potato masher. Serve.
Rachel