Place the self raising flour, caster sugar, cocoa, egg, milk and vegetable oil into a medium bowl and whisk together to combine.

Roughly chop 2 of the Tim Tams and gently stir through the cake mixture.

Pour the mixture into a large mug - making sure you don’t fill it more than halfway as it will overflow otherwise.

Place the mug into your microwave and cook on high for 45 seconds - 1 1/2 minutes. The cooking time will vary depending on your microwave.

Roughly chop the remaining Tim Tam and serve the mug cake immediately with a scoop of vanilla ice-cream and the extra chopped Tim Tam sprinkled on top.