**Prepare the Bread:**
- Remove hard crusts and cut bread into uniform 1-inch pieces.
- Ensure the bread is completely dry. If not, leave it out overnight or bake briefly.
**Dry the Bread:**
- Preheat oven to 300°F (150°C).
- Spread bread pieces evenly on a baking sheet.
- Bake for 10-15 minutes, stirring halfway through, until crisp but not browned.
**Process the Breadcrumbs:**
- Cool bread pieces completely.
- Transfer to a food processor, filling no more than 2/3 full.
- Pulse for 30 seconds to 2 minutes until desired texture is achieved (coarse or fine).
**Season (Optional):**
- Mix in seasonings for a customized flavor.
**Store:**
- Transfer breadcrumbs to an airtight container.
- Store at room temperature for up to 5 days, refrigerate for up to 2 weeks, or freeze for up to 3 months.