Preheat the oven to 180°C/160°C Fan/Gas Mark 4. Grease and line a 900g loaf tin. Place the butter and sugar in a bowl and cream together until smooth.

Add the eggs, Vanilla Extract, mashed banana and yogurt, beat the mixture until all combined. 

Sieve the flour and Baking Powder on top and fold into the mixture until just combined. Finally add the Chocolate Chunks and stir into the mixture.

Pour the mixture into the prepared loaf tin. Dollop the salted caramel sauce onto the mixture and using a cocktail stick swirl through. Sprinkle over the crushed shortbread biscuits. 

Pop in the oven and bake for about an hour until a skewer inserted into the centre of the cake comes out clean. If the cake starts to brown too much on top, cover with foil and continue to bake. Leave to cool in the tin for 20 minutes and then place on a wire rack to cool completely.

Once your banana bread has cooled, pop the Chocolate into a microwavable bowl and heat for 30 seconds then stir, continue to heat for 10 second intervals until your chocolate has melted. Using a spoon drizzle over your banana loaf and then drizzle over the caramel sauce. Your billionaires banana bread is now ready to serve and enjoy!