I repeat. Peanut butter cake in less than 2 minutes.
Put a half cm slice of butter in a mug.
Melt in the micro for 20 seconds.
Whisk in 1 tbsp caster sugar, 1 egg yolk, 1 tbsp peanut butter, 4 tbsp plain flour and a half tsp seasame seeds.
Micro for 1 minute at 800w.
Hide in a cupboard and eat.