I'm not on South Beach, but I make a similar MIM on my plan (Dukan Diet). I usually use cinnamon and vanilla but a couple of other variations I do are using powdered ginger for a gingerbread muffin, and some unsweetened cocoa powder for chocolate.
I also want to try making a savory version with garlic, onion powder, etc. and having it as a side dish, like stuffing, although I haven't gotten around to trying that yet.
I was thinking if I can find a appropriate container I could make a ' bun like' muffin.. and split it for a sandwich.. making just ONE at a time might help me not over eat bread and this has so much fiber it is very FILLING
... like the idea of making a savory one too.. hmmmm have to think what kind of flavors might work