We just moved to Carlsbad from OC and want to find a good place to order a cake - not Costco. I asked my son who will be 4 what he wants on his b-day cake...Mr. Potato Head. I know, what? I want to make it fun, but eatable.
Gotta second The Carlsbad French Pastry Cafe (the one kitchenhag recommends). Real, authentic French pastries. YUM! Also, the Danish Bakery downtown (off of Roosevelt?) may make cakes, though I haven't been there in YEARS!
I get cakes at "My Flavorite Bakery" in Encinitas. Shopping center at the corner of El Camino Real and Encinitas Blvd. They have a great chocolate mousse cake. Same shopping center as Trader Joe's and Ralph's.