Place one Dark Chocolate Oreo Cookie in the bottom of each liner.
Put the cream cheese and sugar in a large bowl. Use a hand or stand mixer to beat the cream cheese and sugar together until fluffy.
Add the eggs, vanilla and melted bittersweet chocolate. Beat again until well combined.
Use a large scoop to place about 1/4 cup of the cheesecake batter into each cupcake liner. They should be filled to the top.
Bake 17 - 20 minutes, or until cheesecakes are puffed up and still have a little "jiggle" in the center, rotating the pans halfway through baking time.
Allow the cheesecakes to cool on the counter and then chill them in the refrigerator for at least two hours or overnight.
When ready to serve, melt about 1/2 cup of the dark chocolate wafers in the microwave and top each cheesecake with a small dollop of the melted chocolate. This is to help the boxed chocolates stick to the cheescakes.
Top each cheesecake with a boxed chocolate to serve.