Prepare Cake mix as directed on box (*note any chocolate cake mix will work but our personal favorite has become a dark chocolate cake.)in 2-9 inch circle pans. Cool completely.
In the meantime prepare filling, to prepare filling: Combining powdered sugar, Crisco, Salt and margarine and beat for 5 minutes. Then add the egg white and vanilla, beat an additional 3 minutes.
Slice each cake into 2 layers...I find the easiest way without a special tool is to use thread (it works great!). Place first layer on plate and spread 1/3 of filling and repeat, using all layers. Your top layer will be Cake.
You will then want to prepare the glaze. Combine Sugar,Cocoa,Milk and margarine in a saucepan. Slowly bring to a boil and boil for 1 minute until thick. I usually end up letting it boil more like 2 minutes because it never seems thick enough. Pour on top of cake, take knife or spatula and cover sides. Let cool and enjoy!
Over the years I've learned to let the glaze cool a bit and thicken after I remove it from the stove, this saves quite a bit of scooping it off the bottom of the plate pouring it back on top of the cake which is what you will be doing if you put it directly on the cake from the stove.