01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together oats, flour, baking soda, cinnamon, and salt in a medium bowl. Set aside.
03 - Beat softened butter and brown sugar in a large bowl until light and fluffy.
04 - Add maple syrup, egg, and vanilla to butter mixture. Beat until well combined.
05 - Gradually add dry ingredients to wet mixture, mixing just until incorporated.
06 - Gently fold blueberries and raisins into the dough.
07 - Drop tablespoon-sized mounds onto prepared baking sheets, spacing 2 inches apart.
08 - Bake for 11-13 minutes until edges are lightly golden and centers remain soft.
09 - Let cookies cool on baking sheet for 5 minutes, then transfer to wire rack to cool completely.