Preheat the oven to 200°C / Fan 180°C/ Gas mark 6.
Melt the Vitabite in a heatproof bowl over a pan of simmering water.
Place the Fate Low Protein Chocolate Flavour Cake Mix into a mixing bowl. Add the margarine, ProZero and vanilla essence.
Using a whisk, mix well for 1 minute, then stir in the melted Vitabite.
Pour the mixture into the lined cake tin.
Bake for 20–25 minutes until risen.
Remove from the oven and leave to cool for 5-10 minutes.
Serve warm or cold with Vanilla ‘Ice Cream’.
For freshness, keep covered in the fridge.
Fate Low Protein All-Purpose Mix, ProZero and Vitabite are foods for special medical purposes and must only be used under medical supervision.