In medium bowl, beat sweet potatoes, 1 tablespoon butter, 1 teaspoon cinnamon, the nutmeg and vanilla with electric mixer on low speed until blended; set aside. In large bowl, beat cream cheese and 1 cup sugar on medium speed about 1 minute or until smooth. Beat in sweet potato mixture on low speed about 1 minute or until blended. Beat in eggs, one at a time. Spoon batter into crust in pan. Place springform pan in larger pan on oven rack. Pour very hot water into larger pan to one-third the height of springform pan.