01 - Heat oven to 350°F and line two baking sheets with parchment paper.
02 - In a bowl, whisk together oats, flour, baking soda, salt, cinnamon, and nutmeg until evenly mixed.
03 - Using an electric mixer, beat softened butter with brown sugar and granulated sugar until light and fluffy.
04 - Mix in eggs one at a time, then add vanilla extract, brewed coffee, and cocoa powder, blending thoroughly.
05 - Gradually add the dry mixture to the wet ingredients, stirring until just combined.
06 - Gently fold raisins and walnuts into the batter ensuring even distribution.
07 - Drop rounded tablespoons of batter onto prepared baking sheets, spacing about 2 inches apart. Bake 12-15 minutes until edges are golden.
08 - Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.