You can use any kind of bread. Lay out your bread on a cookie sheet to dry. My mom cuts the crust off and dries both parts separately.
Once the bread is dry and hard (crouton-like), it’s time to make it into crumbs. Place all the bread into a ziploc bag and use a rolling pin to crush them. I used my Quick Chef (see my favorites list) to make them super fine.
Wahla! Bread crumbs. Store in an air tight container or ziploc until you are ready to use.