Bake for 35 minutes or until a toothpick is clean when testing the center of the cake.
Remove from oven and spread the marshmallow fluff on top. This is easiest to do if you drop spoonfuls all over and then spread it.
Allow to cool.
Icing
Mix melted butter, evaporated milk, powdered sugar and cocoa together in a large bowl.
Spread on top of marshmallow layer.
Sprinkle with additional chopped nuts.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although attempts have been made to provide accurate nutritional information, these figures are only estimates.