From Jersey Mike’s to Panera, these fast-food chains are serving up freshly baked, flavorful bread that takes their sandwiches to the next level.

These are the most popular restaurant chains, broken down by generation—baby boomers, Gen Xers, and millennials.

Jimmy John's was founded in 1983 in Charleston, Illinois, by Jimmy John Liautaud. It originally served just four sandwiches, but its focus on fresh ingredients and quick service helped the ...