Muffin in a Cup Variations

I have been experimenting with the original recipe for Muffin in a Cup. I have used the following and highly recommend you do your own experimenting and sharing.

Lemon/Poppy Muffin
1/2 tsp. lemon extract
1 tsp. poppy seed
1 pkg sweetner
Orange Muffin
1/2 tsp. orange extract
1 pkg sweetner
Banana/Walnut Muffin
1/2 tsp. banana extract
walnuts to taste
1 pkg. sweetner
Chocolate Muffin
1 tsp. baking chocolate
2 pkg sweetner
Blueberry Muffin
blueberries to taste
1 pkg sweeter

and then of course the orginal cinnamon muffin. If anyone else comes up with a varation please post it.