Crush the Oreo Cookies.
Add them into a blender. Blend until they turn into fine crumbs.
Melt the unsalted butter and add it to the Oreo powder. Mix until it is moist and well-combined.
Take the tart mould. Add the mixture into the mould. Press it into the bottom to form an even layer, and then spread it on the sides of the mould.
Refrigerate for 30 minutes.
Chop the Cadbury Bournville Rich Cocoa 70% Dark Chocolate Bar. Transfer it to a bowl.
Add warm milk and chocolate syrup to the bowl. Mix well.
After 30 minutes, pour the chocolate filling over the oreo crust. Spread it gently on top of the tart.
Add some oreo cookies, white sprinkles and cocoa powder on top. Refrigerate overnight.
Enjoy the Oreo and Chocolate Tart (No Bake).