I have seen had good sales with the old standbyes - choc. chip, pb, oatmeal raisin cookies, cupcakes (people like to get things they can eat on the spot), some pies, maybe small ones, brownies and blondies, raspberry bars, chocolate anything. Choc cream pie sells well, but you can't set it out.
you can make packing a little special - things have to be wrapped in plastic/foil, and you can put a little ribbon with a bow on it around them. Some flowers on the table, prices clearly labled, and some pricing like one for 50 cents and six for $2.50. Good luck!
And don't forget to clearly lable for food allergies.