01 - Preheat oven to 350°F and line two baking sheets with parchment paper.
02 - Whisk together flour, cocoa powder, baking soda, baking powder, salt, cinnamon, and nutmeg in a medium bowl until evenly distributed.
03 - Whisk melted coconut oil with cane sugar and brown sugar in a large bowl until smooth. Incorporate espresso, oat milk, and vanilla extract until fully combined.
04 - Gradually add dry ingredients to wet mixture, stirring gently until just combined. Avoid overmixing to maintain tender texture.
05 - Fold vegan dark chocolate chips and toasted hazelnuts into the dough until evenly distributed throughout.
06 - Scoop tablespoon-sized portions of dough onto prepared baking sheets, spacing approximately 2 inches apart to allow for spreading.
07 - Bake for 11-12 minutes until edges appear set while centers remain slightly soft for optimal chewy texture.
08 - Let cookies rest on baking sheets for 5 minutes to set, then transfer to wire rack to cool completely before storing or serving.