Place the flour, baking powder, cocoa powder and salt in a large bowl.

Rub the butter into the dry ingredients.

Place the Nutella into a small bowl and heat gently in the microwave until it is thinner and more runny.

Stir the caster sugar into the main mixture, then add the milk and the Nutella and make a soft dough.

Grease your slow cooker pot lightly and place a large cake case in it or line it with baking paper. Double the layers to prevent the scone burning.

Spoon the mixture into the lined pot.

Place a tea towel under the lid and put the lid back on, and cook on high for 1.5 hrs or until firm.

Allow to cool, drizzle with more warmed Nutella and serve with whipped cream. Eat on the day you make it.