Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
Cream butter, brown sugar, and granulated sugar until light and fluffy.
Beat in eggs one at a time, then add vanilla extract.
Whisk together flour, baking soda, cinnamon, and salt in a separate bowl.
Gradually mix dry ingredients into wet ingredients until combined.
Stir in oats and raisins until evenly distributed.
Scoop tablespoon-sized dough balls onto prepared baking sheet.
Bake for 10–12 minutes until edges are golden brown.
Cool on baking sheet for 5 minutes, then transfer to wire rack.
