Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, cinnamon, ginger, cloves, nutmeg, baking soda, and salt.
In a large bowl, beat the softened butter and brown sugar until light and fluffy, about 3 minutes.
Add the egg and molasses to the butter mixture, and beat until well combined.
Gradually mix in the dry ingredients until just combined.
Stir in the raisins or currants and chopped candied ginger if using.
Drop rounded tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart. Bake for 12-15 minutes, or until the edges are golden and the centers are set.
Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
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