Method:

• Set the oven rack to the center position. Preheat to 300ºF (149ºC).
• Add cubed bread into a food processor. Process on high speed for 30 seconds for coarse breadcrumbs, or 1 minute for fine breadcrumbs.
• Transfer to a large sheet pan or two small pans. Spread evenly in a single layer in the pan.
• Bake for 5 minutes, stir, and then bake another 5 minutes. The breadcrumbs should be lightly browned and feel dry to the touch.
• Bake another 2 to 5 minutes as needed to make to completely dry.
• Allow breadcrumbs to cool on the sheet pan for 10 to 15 minutes.
• Transfer to an airtight container to store.
• For even finer breadcrumbs, add to the food processor and pulse until the desired size is reached.