In a large bowl, cream together margarine and sugar until light.
Beat in egg and vanilla.
In a small bowl, whisk together flour, graham cracker crumbs,
baking powder and salt.
Add to mixture and mix at a low speed until combined.
Divide dough in half and press half of dough into an even layer
on the bottom of the prepared pan. (Donít worry if it seems thin;
the baking powder will allow it to rise).
Place chocolate bars over dough (donít layer the bars, just break
them to fit if you need to)
Spread the marshmallow Fluff over the chocolate bars.
Finally, top the Fluff with the remaining dough by forming the
dough into sheets with the palm of your hands and laying it
down. (Donít worry if the dough isnít covering everything! Itíll
spread out as it bakes.)