1/3 c. butter, melted
1 1/4 c. graham cracker crumbs
1/4 c. sugar
3 (8 oz.) pkgs. cream cheese, softened
1 (14 oz.) can sweetened condensed milk
1 (12 oz.) pkg. semi-sweet chocolate chips or 8 (1 oz.) sq. semi-sweet chocolate
4 eggs
2 tsp. vanilla

Preheat oven to 300 degrees. Combine butter, crumbs and sugar. Pat firmly on bottom of 9 inch springform pan. In large mixing bowl, beat cheese until fluffy. Add condensed milk; beat until smooth. Add remaining ingredients; mix well. Pour into prepared pan. Bake 1 hour and 5 minutes or until cake springs back when lightly touched. Cool at room temperature. Chill. Remove side of pan. Garnish as desired. Refrigerate leftovers.