People often ask me about the cheeses I buy at Trader Joe’s, the emporium famous for its bargains. Alas, the list is short. I buy my feta there—the store’s private-label Greek feta is excellent—but I’m rarely tempted by anything else in the cheese department. The crackers, however! I have fallen hard for TJ’s seedy Norwegian crispbread. These crunchy, grainy flatbreads are so good with fresh, spreadable cheeses—whipped feta, for one—and they make it easy to produce a platter of colorful crostini in minutes.