fill a 900ml (2 pints) wide-mouth jar with the dry ingredients in the following order: oats, raisins, sugar, walnuts, flour (mixed with cinnamon, baking soda and salt).
To make the cookies, preheat the oven to 180C/350F and line a large baking sheet with baking paper.
Melt the butter in a small pot or microwave, then cool slightly.
Mix all the dry ingredients into a large bowl until well combined.
Beat the egg with the vanilla.
Add the melted butter and egg & vanilla and mix with the dry ingredients until well combined.
Divide the dough into 12 pieces (weighing approx. 55 grams each) and roll into balls with your hands. Place these balls on the baking sheet allowing space between the cookies to spread. Press down on each dough ball a little to flatten.
Bake for 12 – 13 minutes until golden brown on the top and edges. Allow to cool on the baking sheet.