I ate a Purple Sno Cone right when I logged on & it showed in the chat window that I had consumed it and received the XP. Then the new game day screen popped up and when I clicked through it, the Purple Sno Cone was still in my inventory. I ate it. The text flashed (like it does when you do something repeatedly).
So I believe I got double XP off one sno cone. Not sure if that's exploitable or not, but thought I'd report it, JIC. :)