Preheat the oven to 325F. Place 12 paper cup liners in a 12 hole regular size muffin tin, and place 1 Oreo thin on the bottom of each.
In a bowl using an electric mixer, beat together the cream cheese, yogurt, sugar, flour, butter, egg, and milk until smooth and creamy.
Divide the cream cheese mixture into the 12 Oreo cups.
Melt the chocolate in the microwave in 30 second intervals, stirring in between each.
Drop a small amount of melted chocolate into the middle of each cheesecake, then use toothpicks to make a swirl effect.
Bake the cheesecakes for 25 minutes.
Let them cool completely, then chill in the fridge for at least 1-2 hours.