Preheat the oven to 350 degrees F.
Mix the ground flax and water together in a medium to large-sized mixing bowl.
Blend half of the rolled oats into fine oat flour.
Add the tahini and maple syrup to the flax mixture and whisk together until smooth.
Add the rolled oats, oat flour, sea salt and baking powder to the mixing bowl with the wet ingredients.
Fold in the hemp seeds, raisins and chocolate chips.
Spray a baking tray with non-stick cooking spray or line with parchment paper or a silicone baking-mat.
Shape the dough into 12 equal-sized cookies and place on the baking tray.
Bake for 14 minutes.
Let the cookies cool on the pan for 5-10 minutes before handling then transfer to a cooling rack to cool completely before storing.
Once cooled, the cookies can be stored in a sealed container at room temperature for up to 4 days, in the fridge for up to 1 week or in the freezer for up to 3 months.