Mix your butter and both sugars on medium high speed in the bowl of your mixer until light and fluffy for about 5 minutes.
Add eggs one at a time and mix until incorporated
Slow your mixer down to the lowest speed and add in flour, cinnamon, baking soda, salt, oats and raisins and finally vanilla extract and mix until it just comes together
Scoop oatmeal cookie dough onto a parchment lined cookie sheet using a standard sized cookie scoop or rounded tablespoon. Chill the dough in the refrigerator for 30-45 minutes.
Bake for 8-10 minutes until golden and set.
Remove from oven and cool for 3-5 minutes or until set before removing.