Roll into 1" (2.5 cm) balls and place on a parchment-lined plate. Create an indentation with the back of a 1/4 teaspoon measuring spoon (or create whatever size indentation you'd like).
Store leftover PB&J thumbprints in an airtight container in the refrigerator for up to 1 week.
For longer term storage, freeze in an airtight container for 1-2 months.
*Every coconut flour absorbs liquids a little bit differently. Start with the lower amount and add more as needed.
**You might need to use more agar agar powder if you use frozen strawberries.