1 bar of any chocolate / choc chips, basically anything you want in it
Method
Into a bowl you need to put your flour, eggs, vanilla extract, basking powder, salt, butter and sugar, If you have choc chips or just chop up a chocolate bar and chuck that in. M&Ms also work well, suppose smarties would too.
Butter your circular baking tray or non circular baking tray it doesn't matter
Once the mixture is all mixed together spread evenly over the baking
Pop it into the oven for 20 mins or so, until your desired gooey-ness
Leave to coolfor a bit while youre searching the freeze for the tub of