Place the ProZero Chocolate flavour, butter, custard powder, sugar and vanilla essence into a small saucepan, over a gentle heat and stir well into a custard.
Keep stirring until the mixture starts to simmer and is thickened to form a custard.
Take off the heat, then pour into a container and use a hand-held blender to blend for 30-40 seconds and leave to cool.
Preheat oven to 190°C/fan 170°C/gas mark 5.
Pour 100mls of the custard mixture into the base of the oven-proof dish.
Arrange the bread triangles to be standing in the layer of ‘Chocolate’ custard. Add ½ the Vitabite chunks evenly over the bread.
Spoon over the remaining ‘Chocolate’ custard and top with the rest of the Vitabite chunks.
Bake in the oven for 20 minutes or until golden brown.