Preheat the oven to 180C/350F. Line a large baking tray with parchment paper or a cookie sheet and set aside.
In a mixing bowl, combine the egg, almond butter, and sugar and mix well. Add the cocoa powder and baking soda and mix until combined. Fold through the chocolate chips and hazelnuts.
Using your hands, shape 12 balls of cookie dough and place them on the lined baking sheet. Press down on each ball of cookie dough into a thick disk.
Bake the cookies for 10-12 minutes. Remove the cookies from the oven and let them cool completely.
Notes
TO STORE: Once the cookies cool, transfer them into an airtight container or bag and store them at room temperature for 3 to 5 days. TO FREEZE: Freeze the cookies for up to 3 months. Put parchment paper in between the cookies to prevent them from sticking to each other. Bring the cookies to room temperature before enjoying them.