Assuming you're asking about adult choices, here were ours:
MGM, Flat Bread Grill: 2 chocolate cakes (small pre-packaged, we took them back to the hotel)
Epcot, Tangierine Cafe: baklava (mine was a big honkin piece!); Yakitori House: a green piece of cake, I think it was ginger maybe, it was good; Sommerfest: big piece of black forest cake.
POFQ Food Court (Float Works?) beignets, pecan pie, cheesecake, carrot cake (all excellent, we asked for styrofoam to-go boxes)
AK, Tusker House: chocolate cake, carrot cake (neither packaged for portability.)
Depending on which restaurants you go to, there can be quite a bit of variety for grown-ups. Be prepared to share with the kids though, or avert your eyes as they slurp up their sugar-free jello-like food-product.