Eggnog Cheesecake... Eggnog Cheesecake   Ingredients For the Crust: 1 stick unsalted butter 1 ¾ c. gingersnap cookie crumbs 3 T. brown sugar For the Cake: 32 oz. whipped cream cheese, softened 16 oz . sour cream (full-fat), stirred 1 stick (8 T.) unsalted butter 5 eggs 2 T. cornstarch 1 ¼ c. sugar 2