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

Preheat oven to 300 degrees. Combine first 3 ingredients. Press crumb mixture on bottom of 9-inch springform pan.

In large mixer bowl, beat cheese until fluffy. Gradually beat in condensed milk until smooth. Add remaining ingredients and mix well. Pour into prepared pan. Bake 1 hour and 5 minutes or until set in center. Cool thoroughly before serving. Refrigerate leftovers, if there are any.