Grease the baking pan and dust with flour,preheat oven to 180 degree.

Put flour,salt,sugar,baking powder,margarine in a mixing bowl whisk on a medium speed.

In another bowl break the egg one by one in margarine whisk till foamy add the flour mixture and mix.finally add the cocoa powder and mix in.finally add the cup of milk

Bake for 30minutes or when skewer is inserted and it comes out clean.