Soak the raisins in lukewarm water for 10 minutes to soften, then drain and set aside.
Let the butter soften at room temperature, then cream together with the brown sugar and powdered sugar until light and fluffy.
Add the egg and vanilla extract, then mix well until the mixture is homogeneous.
In another bowl, whisk together the flour, rolled oats, cinnamon, salt, and baking soda.
Gradually add the dry ingredients to the wet ingredients, and mix with a spatula or by hand until a uniform dough forms.
Work the drained raisins into the dough so that they are evenly distributed.
Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
Form the dough into small balls, and place them on the prepared baking sheet. Flatten them slightly to create cookie shapes.
Bake the cookies in the preheated oven for about 12-15 minutes, or until the edges are lightly golden brown.
Let the cookies cool completely on a wire rack, then serve or store in an airtight container.
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