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["Preheat oven to 400.", "CRUST --", "Combine cookie crumbs and butter; press firmly into bottom of 10-inch springform pan; bake for 8 minutes; cool in pan on wire rack.", "Turn stove temp down to 325.", "VANILLA BATTER --", "Beat cream cheese with mixer until creamy; gradually add sugar, beating well; add eggs (one-at-a-time) beating well after each; stir in sour cream and vanilla; set aside.", "TRUFFLE BATTER --", "Combine cream cheese, melted chips and jam; stir well.", "PUT IT TOGETHER --", "Pour/Spoon two-thirds of the vanilla batter over the crust; then drop rounded spoons-ful of truffle batter over the batter in the pan; pour remaining vanilla batter on top of that.", "Bake at 325 for 80 minutes (1 hr, 20 min)--batter will be ""almost set"" (cake rises above pan);", "TOPPING --", "While that is baking, combine sour cream, sugar and vanilla; set aside.", "When cake has been in the oven for 1 hr, 20 minutes, INCREASE TEMP to 375 and pour topping mixture over the cake; bake 5 minutes.", "Remove from oven, cool in pan on wire rack for several hours.", "Cover and chill in fridge for 8 hours.", "TO SERVE --", "Combine chocolate chips and whipping cream in saucepan (or microwave) until chocolate melts.", "Remove sides of pan, slice into servings; drizzle chocolate over slices of cake.", "Garnish as desired."]