Chocolate Cherry Cheesecake
["8 1/2 oz. chocolate wafers, finely crushed", "1/2 c. butter, melted", "12 oz. semi-sweet chocolate chips", "1 1/2 c. heavy cream", "16 oz. cream cheese, softened", "1/4 c. sugar", "4 large eggs", "3/4 c. cherry flavored liqueur", "1 tsp. vanilla", "1 lb. cherry pie filling", "1/2 c. heavy cream, whipped (optional)"]
["In large bowl, combine chocolate wafer crumbs and butter.", "Pat firmly into a 9-inch spring-form pan, covering bottom and 2 1/2-inches up sides.", "Chill."]
["chocolate wafers", "butter", "semi-sweet chocolate chips", "heavy cream", "cream cheese", "sugar", "eggs", "cherry flavored liqueur", "vanilla", "cherry pie filling", "heavy cream"]