Preheat oven to 400ºF and line a baking sheet with parchment paper. Set that aside.
Drain canned sardines.
Carefully remove sardines from the can and split in half, lengthwise. (See video above for example). Some sardines may break, depending on how tightly packed the can was. That's okay -- you can still use the smaller pieces. But, try to do this step carefully to keep each piece intact.
Blot sardine halves with a paper towel to pull out any excess moisture and transfer to the baking sheet.
Bake for 25-30 minutes, or until crunchy.
Notes
Store in an airtight container in the refrigerator for up to 4 days.