Add hazelnuts to a food processor or a blender and blend until smooth. Stop every couple minutes to scrape down the side of the bowl to make sure nuts are evenly incorporated into a nut butter.
Once nuts are evenly processed, fold in hazelnut oil, vanilla extract and cinnamon. I used a stand mixer on a low setting to make sure everything is evenly incorporated.
Recipe by Pastured Kitchen at https://www.pasturedkitchen.com/recipes/hazelnut-butter/