Make Ahead Tip: Cover and refrigerate the tapenade (Step 1) for up to 1 week. The crostini (Steps 2-3) may be baked several hours in advance, allowed to cool to room temperature, then wrapped and stored at room temperature.
Tip: To make fresh breadcrumbs: Trim crusts from firm sandwich bread. Tear bread into pieces and process in a food processor until coarse crumbs form. One slice of bread makes about 1/3 cup crumbs.