Preheat oven to 160ºC . In a medium saucepan, over Very Low heat or in Microwave on Power 6 melt the chocolate chips and butter. Stir until smooth. Stir in the graham cracker crumbs. Reserve quarter cup of crumb mixture and press rest in a 13x9 inch baking pan. In a large bowl with electric mixer, beat cream cheese until smooth. Gradually beat in the condensed milk, then the egg and vanilla. Pour the mixture over prepared crust. Sprinkle with reserved crumbs and bake at 160ºC . for 25-35 minutes until set. Cool completely to room temperature on a wrie rack, then refrigerate for 2 hours or longer. Cut into 24 squares. tried, MC formatted and posted on TNT by bobbi744@sojourn.com