Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a mixing bowl, whisk together the flour, baking soda, salt, and cinnamon.

In another bowl, combine the prune juice, brown sugar, melted butter, egg, and vanilla extract until well mixed.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Fold in the chopped nuts and chocolate chips if using.

Drop tablespoon-sized balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.

Bake for 10-12 minutes or until the edges are lightly golden.

Allow to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.