At Sprinkles Cupcake in Beverly Hills, making cupcakes is an art. The lighthearted name and nostalgic typography of this cupcakery belies a vision executed with military precision. Mom-and-pop owners Candace and Charles Nelson were investment bankers before they were bakers, which means they've thought of everything and then some: glossy cupcake serving trays, cake mixes sold in canisters, a special display-tower kit - and doggie cupcakes and T-shirts. The expertly frosted pastries are sometimes dusted with toppings and always market with tiddledywinks-style sugar disks that, as inside the lid of a Whitman's Sampler box, decode the 22 flavor combinations. So quickly has Sprinkles taken off that the shop is already bursting at the seams - and the sprinkling of locations has begun.