Wash the raisins and soak them for 10 minutes in hot water. Then drain and pat dry with a paper towel.

Peel the apple, core it and grate it on a fine grater or chop finely in a blender. (Use a juicy apple like Granny Smith, but any variety will work.)

In a bowl, mix the apple, oats, raisins, cinnamon, sal,, and vanilla. Let sit for 10 minutes so the oats can absorb moisture.

Form small balls from the dough using a spoon (about 1 tablespoon each).

Place them on a baking tray lined with parchment paper. Lightly press each ball with your hands to flatten into cookie shapes.

Bake at 350°F (175°C) for 15–20 minutes.

Cool for a few minutes, then transfer to a wire rack to cool completely.