01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the oats, gluten-free flour, baking soda, cinnamon, and salt.
03 - In a large bowl, beat the softened butter with maple syrup and brown sugar until creamy and well combined.
04 - Add the egg and vanilla extract to the wet mixture, beating until smooth.
05 - Gradually mix the dry ingredients into the wet ingredients until just combined.
06 - Fold in the walnuts and raisins with a spatula.
07 - Scoop rounded tablespoons of dough onto the prepared baking sheets, leaving about 2 inches between cookies.
08 - Bake for 10–12 minutes, or until edges are lightly golden and centers are still soft.
09 - Allow cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.