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Preheat the oven to 375. Lightly grease a 9x13 baking dish.
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In the bowl of your mixer, cream together the butter and brown sugar. Next, beat in the egg until the mixture is light and fluffy.
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Add in the vanilla, spices, baking soda, and milk. Mix. Add the flour and mix until just incorporated.
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Fold in the raisins and walnuts.
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Press the cookie dough into your prepared baking dish.
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Bake at 375 for 25-30 minutes.
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Allow your Hermits to cool in the pan before slicing. Store in an airtight container at room temperature or you can freeze your cookie bars to last longer.