Preheat oven to 180°C. Line a cookie sheet with baking paper. Whizz oil, orange rind, orange juice, flour, baking powder, sugar and salt with a hand blender. Add the rest of the ingredients and mix well with a wooden spoon.
Take a tablespoon of mixture and form small flattened rounds with your palms. Place on the prepared cookie tray a few centimeters apart. Bake for 20 minutes. Remove from the oven and cool on wire racks. Store in an air-tight jar when completely cooled.