Preheat the oven to 350°F. Line a baking sheet with parchment paper or a silicone mat.

In a large bowl, combine the flour and spirulina powder.

In a small bowl, stir together the peanut butter and egg until smooth.

Add the peanut butter mixture to the flour mixture. Stir and add water as needed to make a rollable dough.

Place the dough on parchment paper. Roll dough out with a rolling pin to about ¼-inch thick.

Use a cookie cutter to cut out as many treats as possible. Gather scraps, re-roll, and cut until all the dough is used.

Place the cutouts on the lined baking sheet. Bake for 15-18 minutes.

Allow the treats to cool completely on the baking sheet.

Store leftovers in an airtight container.