Preheat the oven to 350 degrees F.
In a large bowl, beat the butter and the sugars on medium speed until creamy.
Add the eggs and vanilla, and beat until incorporated.
In a separate bowl, mix the flour, baking soda, cinnamon, and salt. Add to the wet ingredients and beat to combine.
Add the oats and the raisins and thoroughly combine.
Drop by rounded tablespoonfuls onto ungreased cookie sheets. (See notes) Bake 8-10 minutes or until just cooked and lightly golden.
Cool completely and store in an airtight container.