Line a 9x13 pan with foil and spray with cooking spray or wipe with cooking oil. Combine flour, graham crackers, baking powder and salt. Mix together butter and sugar, then gradually add eggs one at a time mix well. Slowly add in dry mixture. Divide dough in 1/2. Press 1/2 the dough in the bottom of the pan until flat. spread the marshmallow cream over the top of it and sprinkle chocolate chips over the cream, crumble remaining dough over top in clumps. Bake at 350. let cool then cut into bars and serve.