01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together oats, flour, cocoa powder, cinnamon, ginger, nutmeg, cloves, baking soda, and salt.
03 - In a large bowl, beat the butter, brown sugar, and granulated sugar until light and fluffy.
04 - Add the egg and vanilla extract to the creamed mixture and mix until well combined.
05 - Gradually add the dry ingredients to the wet ingredients, mixing just until incorporated.
06 - Fold in the raisins and chocolate chips if using.
07 - Drop tablespoon-sized portions of dough onto the prepared baking sheets, spacing them approximately 2 inches apart.
08 - Bake for 11 to 13 minutes, until edges are set and centers remain soft.
09 - Allow cookies to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.