01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking soda, baking powder, salt, cinnamon, and nutmeg in a medium bowl. Set aside.
03 - Beat softened butter, brown sugar, and granulated sugar in a large bowl until light and creamy.
04 - Add egg and vanilla extract, beating until well combined.
05 - Gradually add dry ingredients to wet ingredients, mixing just until incorporated.
06 - Stir in oats, grated carrots, nuts, and raisins until evenly distributed.
07 - Drop heaping tablespoons of dough onto prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 11-13 minutes, until edges are golden and centers are still slightly soft.
09 - Let cookies cool on baking sheets for 5 minutes before transferring to a wire rack to cool completely.