01 - Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
02 - Whisk together rolled oats, all-purpose flour, baking soda, ground cinnamon, and salt in a large mixing bowl.
03 - In a separate bowl, beat softened butter, granulated sugar, and light brown sugar until pale and creamy.
04 - Blend in eggs one at a time, followed by pure vanilla extract, mixing well after each addition.
05 - Gradually fold the dry mixture into the wet ingredients until just combined.
06 - Stir in raisins with a spatula to evenly distribute throughout the dough.
07 - Drop rounded tablespoonfuls of dough onto prepared baking sheets, spacing cookies 2 inches apart.
08 - Bake for 10 to 12 minutes, or until edges are golden and centers remain soft.
09 - Transfer baking sheets to wire racks and allow cookies to cool completely before serving.