All you need is a measure, a cup a bowl etc what ever suits you.
cocoa powder or cooking chocolate
water/ milk (this makes it richer)
a tiny bit of salt
walnuts/ other nuts / chocolate chunks etc (optional)
All you need to do is mix equal quantities( whatever measure you have chosen) of the flour, sugar, cocoa powder, oil, milk/ water, a tiny bit of salt together till you get a smooth shiny mixture. Work in some air. Mix in the nuts.
(If you are using cooking chocolate melt the desired quantity in cream, cut the oil quantity and sugar as per taste)
grease a flat tray or pan or dish that is microwave proof. Pour in the mixture. cook in the microwave on high for 3 minutes rest half a minute and another 3 minutes. should be done. If not run for another 2. And voila!! done!!
Cut and serve as desired with ice cream or fudge.