Grease and line cake tin or line slow cooker
Beat butter and sugar with electric mixture until light and fluffy
Add eggs one at a time, beating until combined.
Stir in bananas and vanilla essence(mixture will look curdled)
Combine milk and bicarbonate of soda in a small jug.
Fold in flour and milk into banana mixture.
Add melted Nutella, stir until combined.
Pour into tin or slow cooker, tea towel under lid, cook on high 2 hours until skewer comes out clean.
Submitted by Belinda Hind