Crush the Oreo Cookies.
Cut the dark chocolate into pieces.
Add butter and sugar to the dark chocolate and microwave for 20s at a time till the ganache is smooth.
Mix the all purpose flour, powdered sugar, baking soda, baking powder and Cadbury Cocoa Powder and seive well.
Add the powdered mixture to the dark chocolate ganache.
Add 2 cups of crushed Oreo cookies and mix well.
Add milk and mix until smooth.
Spread the mixture evenly on a flat plate.
Bake at 170 deg celsius for 25 minutes to form the pizza base.
Add 1/2 cup powdered sugar to cream cheese and mix until smooth.
Add 1 tsp vanilla extract to the crèam cheese mixture and blend.
Spread the cream cheese mixture evenly on the baked pizza base.
Add crushed Oreo cookies on top of the cream cheese layer as toppings.
Slice the pizza. Drizzle chocolate sauce over the slices and enjoy.