1. Peel skin off top quarter of each apple. Using melon baller, scoop out core, leaving bottom intact.
2. Stand apples in 13x9x2-inch baking pan. Mix sugar and spices in bowl. Reserve 2 tablespoons mixture.
3. Fill apple cavities with remaining sugar mixture. Spoon 1/2 tablespoon maple syrup into each cavity.
4. Scatter 3 tablespoons butter pieces over apples. (Can be made 4 hours ahead. Cover; chill.)
5. Preheat oven to 350°F.
6. Pour water into pan with apples, then add reserved 2 T. sugar mixture, 2 T. maple syrup, and 1 T. butter.
7. Bake until apples are tender when pierced with skewer, about 1 hour. Transfer apples to 8 bowls.
8. Place baking pan atop 2 burners; boil over medium-high heat until syrupy, about 2 minutes.
9. Spoon sauce over apples. Serve with vanilla ice cream or whipped cream, if desired.