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Preheat the oven to 350 degrees. Grease an 13x9" baking pan.
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Use a mixer to cream together the butter and sugar until light and fluffy.
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Beat in the egg and vanilla. Set aside.
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In a large bowl,whisk together flour, graham cracker crumbs, baking powder and salt. Slowly add flour mixture to the butter mixture, until combined.
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Divide dough in half and press half of dough into an even layer on the bottom of the prepared pan.
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Place chocolate bars over dough.
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Spread marshmallow creme over the chocolate bars.
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Place remaining dough in a single layer on top of the marshmallow. If you roll sections of dough out on the counter and lay them piece by piece on top, it's easier. You can press them together with your fingers.
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Bake for 30 minutes, until lightly browned.
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Be sure to cool completely before cutting into bars.