In a large bowl, cream together the butter and sugars with an electric mixer until light and fluffy.
Add the eggs and vanilla and beat well.
In a medium bowl, whisk together the oats, flour, baking soda, salt, and cinnamon.
Gradually add the dry ingredients to the wet ingredients and mix well.
Stir in the raisins.
Cover the dough with a plastic wrap and refrigerate for at least an hour.
Preheat oven to 350°F (177°C) and line two baking sheets with parchment paper or silicone mats.
Drop rounded tablespoons of dough onto the prepared baking sheets, leaving about two inches of space between each cookie.
Bake for 10 to 12 minutes or until golden brown around the edges.
Let the cookies cool on the baking sheets for five minutes, then transfer them to a wire rack to cool completely.