Fantastic French bakery! Definitely worth a stop if you're passing through Issaquah.
To start with, the pastry case is loaded with traditional French pastries, but often blended with unique flavors. You absolutely must get a cream puff (the raspberry, or anything fruity, is my favorite). But beware: these aren't your nanas cream puffs. These are hefty, the size of a baseball, with a lovely crunchy topping and plenty of cream. I'd also recommend at least one kind of croissant (I like the savory ham one) and a kouign amann—both super flaky and delicious, especially warmed up. Lastly, the blackberry almond financier is an unexpected favorite. It tastes like the best muffin you've ever had. Definitely grab one of those.
In addition to the pastries, they have a cafe serving hot and cold drinks. I tried the house-made hibiscus lemonade and I'd highly recommend it if you like a sweet drink.
They also offer an extensive menu of entrees. The reuben (supposedly legendary) is indeed delicious—it's not particularly unique, just a classic executed really well. The fried egg sandwich is also really tasty. The quiche is delicious, but I gotta be honest: it's mostly cheese, so it's pretty dense and heavy. If you're into that, it's delicious, but if you're looking for a more traditional, light quiche, you might wanna skip this one. The French toast is fine but nothing special, similar to what you'd find at any diner.
Crumble & Flake is worth going out of your way for! Truly excellent food!