Instructions

1. Preheat oven to 180 C (350 F) standard / 160 C (320 F) fan-forced. Grease and line an 8-inch square pan with paper baking, ensuring two sides of the paper overhang.
2. Add butter and chocolate to a heatproof bowl and microwave until melted, stirring every 30 seconds. Leave to cool slightly.
3. Next, add the sugars and vanilla to the chocolate mixture and stir. Add eggs, one at a time, and stir again. Then add flour and cocoa and stir until mixture is smooth.
4.  Pour brownie mixture into prepared tin and very gently smooth over the top. Add Oreo cookies on top of the brownie batter in one even layer.
5. To make the cheesecake, add cream cheese and sugar to a mixing bowl and beat with an electric mixer until smooth and creamy. Add vanilla and egg and beat briefly to combine.
6. Finally, add yogurt or sour cream and mix on low speed until combined and creamy. Pour cheesecake mixture over Oreo cookies and gently smooth the top.
7. Bake cheesecake brownies for approximately 40 minutes or until they no longer wobble in the middle. Turn off the oven and leave the brownies in the oven for 20-30 minutes to cool down. Before removing and leaving to cool completely on a wire rack.
8. When they are completely cooled, cut cheesecake brownies into small squares to serve. Store brownies in the fridge.