Combine the butter, sugar, milk and cocoa in a pot. Stir on the stove until the mixture homogenizes and the sugar melts.
Set aside 1/2 of this mixture. To the remaining cooled mixture, add the flour, baking soda and eggs.
Pour the mixture into a greased tray, sprinkle with breadcrumbs and bake. After you remove the cake from the oven, pour on the set aside chocolate sauce.