line an 8+8 baking dish with wax paper and spray with butter

mix together butter and sugars until fluffy

beat in egg and vanilla until combined

stir in flour,baking powder,salt and Graham cracker crumbs

spread 2/3 of dough on bottom of pan

lightly press peanut butter cups into dough

spread marshmallow fluff on top

press remain dough into shape of pan and put on top of marshmallow fluff and press down lightly

bake at 350 for 30 minutes or until brown

allow to cool for 2 hours to set

remove from pan and cut into squares