Marbled Chocolate Cheesecake

To make crust, mix together chocolate wafer crumbs and melted butter in a medium bowl until combined. Press into a 9-inch springform pan.

To make filling, beat together cream cheese, sugar and eggs at medium speed of electric mixer until smooth and fluffy. Spoon half into crust.

Stir 2 ounces melted chocolate into remaining filling. Drizzle over filling in crust and drag a knife through to make swirls.

Transfer pan to a wire rack. Cool completely.

Transfer cheesecake to a serving plate. Cover with plastic wrap and refrigerate for 2 hours.

Uncover cheesecake. Carefully remove the sides of the pan.

To make frosting, combine 6 ounces chocolate and sour cream in a small bowl. Spread over cheesecake. Refrigerate briefly until set.