Step 1: Spray or butter a 24 cm microwaveable bowl.
Step 3: melt the butter and mix with sugar, milk and vanilla together in a bowl until combined.
Step 4: mix the dry ingredients together.
Step 5: mix all dry and wet together and transfer it into the buttered bowl
Step 7: for the sauce mix the vanilla and dark brown sugar and chocolate powder with the hot water and pour it on to the top of the mixture.
Step 9: microwave for 5 minutes or until you have achieved the desired consistency!!
Step 11: for ultimate gooeyness , microwave for 3.5 minutes.
Step 13: must must!!! Have it with ice-cream!!