• Pre-heat oven to 350° (180°C). Grease and flour an 8-9 inch (depending how thick you like your base, I used a 9 inch for this one) cake pan (20-24 cm). A spring form pan is my recommendation.
• In a large bowl whisk together the flour, sugar, baking powder and salt, add butter, using a pastry blender or fork combine to form a coarse crumb mixture, add the egg and continue to mix only until still crumbly.
• Place approximately ⅔ of the crumbly mixture in the cake pan, lightly pat down. Spread the Nutella* evenly on top and sprinkle with remaining crumb mixture.
• Bake for approximately 30-40 minutes or until lightly golden on top. Let cool. Enjoy!

*If the Nutella is hard, place in a small plate and over a pot of boiling water stir until smooth and soft.

If you find the dough not crumbly enough then add a bit more butter. But remember it must be crumbly and not come together like a traditional pie dough.