Preheat oven to 350°F. Grease an 8-inch square baking pan.
In a large bowl, cream together butter 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 butter 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. Place chocolate bars over
dough. 2 king-sized Hershey’s bars should fit perfectly side by
side, but break the chocolate (if necessary) to get it to fit in a
single layer no more than 1/4 inch thick. Spread chocolate with
marshmallow creme or fluff. Place remaining dough in a single
layer on top of the fluff (most easily achieved by flattening the
dough into small shingles and laying them together).
Bake for 30 to 35 minutes, until lightly browned. Cool completely
before cutting into bars.
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