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Preheat oven to 350 degrees.
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In a large bowl or stand mixer, beat the butter until soft and creamy (about two minutes).
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Add the sugars and continue beating until the mixture is light and fluffy. (May take several minutes).
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Add the eggs and vanilla and beat until smooth.
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Add 1 cup of the flour, along with 1 tsp. baking soda, 1/2 tsp. salt, and 1/2 tsp. cinnamon. Mix together until everything is incorporated.
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Add the other cup of flour and mix until well incorporated.
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Add the oats and stir well.
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Add the raisins and stir well.
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Using a large cookie scoop, place cookies about 2 inches apart on a large baking sheet that has been lined with a silicone baking mat.
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Bake cookies for about 12 minutes, until edges just barely start to brown.
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Remove from oven and let rest on pans for about 10 minutes. Then transfer to wire racks to cool.