Sure, there's a lot of hubbub about Crumble + Flake right now, but for my money, it's hard to beat Bakery Nouveau in West Seattle (and now in Capitol Hill, at 15th and E. John). This immensely popular place always has lines snaking through the store and out the door, but it's worth the wait—though you might want to send one of your group out for coffee while you're in line.
The wait does give you plenty of time to greedily eye the cases full of macarons, truffles, tarts, cakes, Danishes, baguettes, and foccaccia pizzas. They offer quiches and delicious, hearty $8 sandwiches, plus whole cakes made to order. Perfect for an afternoon treat on a rainy day, and don't forget to take some home for later!