Dennis,
I'm in the same situation and tend to avoid dessert, though I'll make an exception for cheese cake. But, I'd think in terms of stuff that is easy to make and will result in minimal leftovers. 'course, you can also make a desert that is diabetic-friendly. Sugar-free Jell-O. Comes to mind.
But, if you aren't concerned about that, make brownies, cookies or something else that is a mix that comes out of the box from the baking section of the supermarket. Very easy. Minimal fuss. Always yummy.
Or, cookies made from Pillsbury premade mix from the dairy section. Open package. Slice. Drop on baking pan. Cook until done. Easy to drop in a bag so you can ensure your guests take leftovers home with them.
Or, if you want to be really bold, carrot cake. Personally, I think it's a side dish but to each his/her own.
A ton of things come to mind but short of cutting up some melon and dropping it into a bowl, I'd stick with something cheap, easy to make and easy to take home or something that is sugar-free/low carb and acceptable within the confines of your diet.
Robert