Secrets to a moist/dense cupcake?

[t325t]

So what is everyone's secret to making a dense and moist cupcake that seems to be the norm at all these boutique bakeries?

Seems like most recipes create a lighter/fluffier cupcake that is comparable to what comes out of a box.

Is it more butter? Oil? Ideas and tips please!

[dmenifee]

I Use Butter To Get It Moist! Oil Seems To Give It An Oily Taste!