Place sweet potatoes in 3-quart saucepan; add enough water (salted if desired) to cover. Heat to boiling; reduce heat. Cover and simmer 30 to 35 minutes or until tender; drain. Remove skins; cut each sweet potato lengthwise in half.
Heat oven to 375º. Place sweet potatoes, cut sides up, in ungreased 2-quart casserole or square baking dish, 8x8x2 inches. Spread applesauce over sweet potatoes. Mix brown sugar, nuts and cinnamon; sprinkle over applesauce. Dot with butter. Cover and bake about 30 minutes or until hot.