The teacher will buy a variety of breads such as banana bread, pumpkin bread, etc. Another way is to have parents donate the items needed. I usually put up a sign up sheet in my Classroom Shutterfly website.
Another good idea is Sign Up Genius.
The point is to have different types of bread for the students to taste.
Then ask which they thin they will like more.
Taste and find out,
I like to do this in small groups during centers.
I have a parent man the center.