For the Brownie Layer:
4 eggs1 cup (250 mL) brown sugar packed½ cup (125 mL) softened butter¾ cup (175 mL) cocoa powder½ cup (125 mL) Nutella⅓ cup (75 mL) flour
Nutella Cheesecake Layer:
8 ounce (225g) softened cream cheese½ cup (125 mL) Nutella½ cup (125 mL) sugar2 eggs

Method:
Preheat oven to 350ºF (180ºC)

Cream together softened butter and brown sugar. Beat in Nutella and eggs. Add flour and cocoa until combined.
In a separate bowl, beat together cream cheese, Nutella, sugar, and eggs. Scrape the brownie batter into the bottom of an 9×9 pan, and spoon the Nutella cheesecake mixture over the top of the brownie batter. 

Smooth the cheesecake carefully over the brownie layer with a spatula.  Bake for 50-55 minutes, the centre of the brownies will be set, but a cake tester won’t come out dry.  Cool completely to set up before you cut it into squares.