Prep a double boiler to melt chocolate, by adding a pot of water to the stove and heat over high to boil and add a stainless steel bowl over the pot and add the chocolate.
Meanwhile, in a Vitamix, food processor, or blender, grind the hazelnuts into a paste. You may have to scrape down the edges to fully blend.
Add oil, sugar, cacao, salt, and vanilla and continue to blend. Again, you may need to scrape down the edges to ensure it all blends well.
While the water boils, let the chocolate melt and stir constantly - ensuring that it doesn't burn or overhead which will result in it seizing. Stir until it is smooth.
Add the melted chocolate to the hazelnut mixture and blend again until smooth.
Pour the homemade Nutella into a jar or other resealable container and let it cool and thicken. Or use immediately if desired.
Enjoy!