and bake to the box directions.
THEN - not before, after.... that's the tricky part... while the brownies are still piping hot...
cover hot brownies with a layer of walnuts
cover the walnuts with marshmallows
cover the marshmallows with chocolate fudge frosting
Do all of this as quickly as you can because it has to go together while everything is hot
...the marshmallows and the frosting get all melty together...
And then you have to hide them so they don't disappear before they get where they need to go.