Almond flour or almond meal: Use whichever you have or prefer. Almond flour is pale and finely ground (from blanched almonds); almond meal is coarser with specks from the skins.
Almond extract (optional): Add ¼ teaspoon to the filling or dough for stronger almond flavor.
Storage: Store in an airtight container at room temperature for up to 3 days, in the fridge for 1 week, or freeze for up to 2 months.