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In a medium bowl, whisk together flour, baking soda, salt, ginger, cinnamon, mixed spice and nutmeg and set aside.
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In a large bowl, cream together the butter, ½ cup of caster sugar and brown sugar using an electric mixer until light and well blended. Mix in the egg, and then add the molasses and vanilla.
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With the electric mixer on low, add the dry ingredients in batches, ensuring each time they are fully combined before adding more.
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Cover the bowl with plastic wrap and put in the fridge for 1 hour. In the meantime, preheat your oven to 180C (350F).
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Line a baking tray with baking paper and get your dough out of the fridge. Put the remaining 3 tablespoons of caster sugar in a bowl and set aside.
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Scoop the dough out about 1 ½ tablespoons at a time and shape into a ball. Roll in the caster sugar and set on the baking tray, leaving a few centimetres between each cookie. Once you have a whole baking sheet completed, flatten the top of each cookie slightly. Complete this until you have no dough left, ensuring you return unused dough to the fridge between batches.
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Bake the cookies in the oven for 10 minutes, or until browned slightly. Cool on the baking sheet for several minutes and then transfer to a wire rack to cool completely.