In the cafes, this popular veggie sandwich is served on pillowy, fluffy tomato basil bread. This is an extra-special type of bread you can only find at Panera. It's so soft and fluffy with a slightly sweet crumble topping that makes it even more delicious. You can buy a loaf at your local Panera and keep it in your freezer, but you'll have a hard time finding anything similar in grocery stores. Instead, look for soft whole-grain bread sliced into slightly thick slices for a similar bite and texture.