01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, salt, cinnamon, and nutmeg.
03 - In a large bowl, use a mixer to cream softened butter with brown and granulated sugars until light and fluffy.
04 - Beat in the egg and vanilla extract until fully combined.
05 - Gradually add the dry mixture to the wet ingredients, stirring until just combined.
06 - Gently fold in finely chopped kale, rolled oats, dark chocolate chips, and walnuts until evenly distributed.
07 - Drop rounded tablespoons of dough onto the prepared baking sheet, spacing approximately 2 inches apart.
08 - Bake for 13 to 15 minutes or until edges are golden and centers are set.
09 - Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.