Preheat your oven to 300°F (150°C).

Take your leftover pretzel buns and break them or cut them into smaller pieces. If they're already hard, that's perfect! If they're still a bit soft, you can let them sit out for a few hours or overnight to dry out further.

Using food processor grind the bread to desired consistency

Spread the pretzel crumbs evenly on a baking sheet lined with parchment paper or a silicone baking mat (optional).

Place the baking sheet in the preheated oven and toast for about 10-15 minutes, stirring occasionally, until they're golden brown and fragrant. Keep an eye on them to prevent burning. The finished bread crumbs should be lightly browned and feel dry to the touch.

Once toasted, remove the pretzel breadcrumbs from the oven and let them cool completely on the baking sheet. Transfer them to an airtight container or resealable bag for storage. They'll stay fresh and crunchy for weeks at room temperature or even longer in the freezer.