first you have to Mix together all the ingredients and bake in greased & floured 9 x 13" pan at 350 degrees for 35 to 40 minutes. Remove cake and leave in pan, while cake is hot spread 7ounces marshmallow cream over the top of the cake, let cool.
The Second Step:
Next step should comes immediately
While cake is cooling;
The Third Step:
For icing bring to boil 3 tablespoons cocoa, 1 stick margarine and 1/3 cup milk.
The Fourth Step:
now you should Remove it from heat and add 1 teaspoon Vanilla and 1 box of powdered sugar, beat it well and spread over cake while warm.
The Final Step:
remove it untill it becomes completely cool and divide into serving pieces.