All you have to do is take a cup of flour,
Add it to the mix.
Now just take a little something sweet, not sour,
A bit of salt, just a pinch.
Baking these treats is such a cinch,
Add a teaspoon of vanilla,
Add a little more, and you count to four
And you never get your fill of…

Cupcakes – so sweet and tasty.
Cupcakes – don't be too hasty.
Cupcakes – cupcakes, cupcakes, CUPCAKES!
Anonymous

Fill of…

For some reason, I always heard it as fill-a.

Your way makes a lot more sense!