preheat oven to 300°F.

for the crust: in a medium bowl,combine cracker crumbs and sugar.add melted butter stiring to combine

press the crust into the bottom and 1 inch up the sides of a 9 inch springform pan. Bake for 6 minutes,let cool

for the chocolate layer: using double boiler,melt the chocolate and butter,(or microwave on high in 30 second intervals,stiring after each,until chocolate is melted and smooth,about 1 1/2 minutes total)

whisk in the sugar,eggs,and flour until just combined. pour into the bottom of the cooled crust and bake for 15 minutes, let cool

for the cheesecake layer: spread the caramel topping evenly over the cooled chocolate layer.

cut the cookie dough crosswise into 1 inch slices. place the slices in an even layer over the caramel,pressing gently together to seal edges.

in a large bowl,beat the cream cheese and sugar on medium speed with an electric mixer until creamy.

beat the eggs,1 at a time,beating well after each addition.

beat in the vanilla and flour until just combined.

stir in the sour cream.pour the mixture over the cookie dough layer and bake for 1 hour.

remove from.the oven and gently run a knife around the edges to release the crust from the sides of the pan.

let cool completly.

for the ganache: using a double boiler,combine the chocolate and cream and melt ( or microwave on high in 30 second intervals,stiring. after each, until the chocolate is melted and smooth,about 1 minute total).

spread over the cooled cheesecake.