Super Yummilicious Little Lemon Cakes

1 box yellow cake mix
16 oz.sour cream
2 eggs
2 (or more) lemons
butter, softened
sugar
You will need microwave safe coffee cups or little bowls. This makes app. 10 cakes.
Mix cake mix, sour cream, and eggs. Zest one lemon (grate the rind on a teeny-tiny grater-do not grate the fruit) and add to the mix.
Slice second lemon into thin slices.
Grease coffee cups with butter, then pour some sugar in and move around until inside of cup is coated with a thin layer of sugar.
Place lemon slice in the bottom of 5 cups. Pour mix on top until cups are half full. Microwave all 5 cups for six minutes. Turn upside-down on plate. *Tap on the sides of the cup to loosen cake.
Clean cups and make 5 more.
Serve topped with whipped cream or lemon sauce
(stolen from the Theler blog)