In a 1 litre jar, layer the ingredients in the following order: half of the oats, half of the brown sugar, flour. Mix together the sugar, bicarb soda and cinnamon, put on top of flour, then remaining brown sugar and remaining oats. Screw on the lid and attach a tag with the following instructions:
Preheat the oven to 190 degrees C. Grease baking trays. In a large bowl, beat 300g butter with 1 egg and 1 teaspoon of vanilla until fluffy. Stir in the contents of the jar. Drop biscuits by rounded tablespoons 5cm apart onto the prepared baking trays. Bake for 8 to 10 minutes in the preheated oven. Cool on baking trays for 1 minute before removing to wire racks to cool completely.