Melt butter, add cocoa, eggs, sugar, and flour. Beat well. Add pecans and coconut. Pour into a greased 9x13 pan. Bake at 350 degrees for 30 min.
Remove and immediately spread a thin layer of marshmallow creme.
Beat all ingredients, except nuts, until smooth. Add nuts. Spread on top of marshmallow creme.Let cool, cut into squares and remove from pan to serve.