Preheat oven to 350°F (175°C). Line baking sheets with parchment.
Beat butter and both sugars for 2 to 3 minutes until fluffy.
Add eggs one at a time, beating after each.
Add vanilla. Mix well.
Whisk together flour, baking soda, cinnamon, and salt.
Add flour mixture to butter mixture. Mix on low until just combined.
Stir in oats until evenly distributed.
Fold in raisins gently.
Drop rounded tablespoons onto baking sheets 2 inches apart.
Bake 10 to 12 minutes until edges are golden.
Cool on pan 5 minutes then transfer to wire rack.