Flatbread has a thin golden crust and a soft, hole-filled interior. Look for it in the bakery section of the grocery store. If flatbread is unavailable, focaccia bread makes a tasty alternative.
For quick and easy assembly of more sandwiches, cut remaining bread loaf into 3-inch squares. Place in freezer-weight resealable plastic bag and freeze up to 3 months. When ready to use, thaw desired number of bread slices at room temperature. If desired, bread can be freshened by unwrapping the bread slices and heating in 425°F-oven 3 to 5 min. or just until warmed. Use as directed.