In a medium-sized mixing bowl, whisk together the hazelnut butter and oil. Whisk in ¼ cup of the cocoa powder, the stevia and vanilla.
Whisk in the almond milk, approximately ¼ cup at a time, whisking between each addition.
Whisk in ¼ cup of the cocoa powder, followed by ½ cup of the powdered sugar (or erythritol). Repeat with the remaining cocoa powder and sweetener.
Whisk vigorously to get rid of any clumps and taste test. It should be creamy and sweet, but you can adjust to taste with 1/16 teaspoon of salt, more stevia, and/or more cocoa, if desired.
Serve immediately or store in a sealable jar in the fridge. Stir before using.
Recipe by Go Dairy Free at https://www.godairyfree.org/recipes/healthy-homemade-dairy-free-nutella