Bake in a preheated 325°F oven for 30-35 minutes. Remove from oven and cool on a rack for
10 minutes.
Spread the marshmallow fluff over the top of the slightly cooled but still warm cake layer.
Allow cake to cool completely.
Spread frosting over the marshmallow fluff layer. Scatter the candy pieces over the frosting.
Refrigerate for an hour
before cutting.