Heat oven to 180°C.
Whizz the oats in a food processor until quite fine, then add the remaining ingredients and whizz again until the dough comes together.
Roll out the dough on a floured work surface to a 5mm thickness.
Cut into squares, circles or shapes with biscuit cutters and place on baking trays (no need to grease or line).
Bake for 15-20 mins or until pale golden and slightly firm.
Remove from the oven and carefully transfer to a wire rack to cool.
These will keep for 5-6 days in an airtight container, and they freeze well, too.
This recipe is by Rachel Allen and is reprinted with the permission of the BBC Lifestyle channel.