How To Toast Crostini. Toast the crostini up to 3 hours ahead. Crostini is an easy appetizer with thin baguette slices lightly toasted until golden brown and crispy.

Wait until they cool completely to put them in the bag or they will steam it up and get soggy. Preheat air fryer to 400f cook for five minutes, flipping after three minutes this recipe is based of using the cosori air fryer (5.8qt model, affiliate link). You do not need to reheat crostini before using it again, but you can heat it up by placing it on a baking sheet for about 5 minutes.