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1
Grease a 9x13 baking pan, and set aside.
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2
Beat butter and sugars in a large bowl with a hand mixer until light and fluffy.
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3
Add egg and vanilla; beat well.
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4
In a small bowl, whisk together the flour, graham cracker crumbs, baking powder and salt.
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5
Add to butter mixture, beating until blended.
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6
Press half of dough into an even layer on the bottom of the prepared pan (it will be sticky).
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7
Preheat oven to 350 degrees F.
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8
Arrange chocolate bars over dough, breaking as needed to fit.
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9
I only needed to break up the last one, I think.
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10
If you don't cover all of the graham part, it's ok, the chocolate will melt and spread out while baking.
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11
Spread the marshmallow creme over the chocolate (if you dip a metal utensil in hot water before doing this, it makes it a little easier).
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12
Place remaining dough in a single layer on top of the marshmallow fluff (this is most easily achieved by first flattening dough into panels and then laying them on top).
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13
It's ok if a little of the marshmallow is showing.
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14
Bake 30 to 35 minutes or until lightly browned.
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15
Cool completely in pan on wire rack before cutting into bars.
