Every time I am at a banquet or reception and they have those cookies with a Hershey's Kiss in the middle (especially if they are peanut butter cookies) I will eat almost the whole tray of them and leave all the other assortments, lol. I especially love them if they've been in the fridge and are chilled.
My next favorite cookie would be those "thumbprint" cookies that have some apricot or raspberry jam in the middle of them, and usually a coconut flaked exterior. They've got so many different flavors going on at once all in one cookie - tangy fruit, sweet but nutty toasted coconut, and a creamy butter cookie center.