Crostini, which are toasted slices of bread used as an appetizer or snack, can be made with many different types of bread. For crisp and savory crostinis, the best type of bread to use is a crusty Italian loaf, such as ciabatta or focaccia. However, if you want to add some variety to your Crostini game, try French baguettes, which also work great, or multigrain loaves or sourdough.