I regularly make cupcakes with buttercream and they generally have something in the region of 12-14pp per cupcake. Depends how much buttercream was on the top though because thats the real point killer lol.
Is that 'as prepared' though? With things like mixtures etc it's very difficult to point unless the NI is as prepared because they get higher when you make them. Things like powdered soup etc often list the NI of the item in it's original form, then it changes when water/milk etc is added.