Preheat your oven to 400°F (200°C). Spread the hazelnuts on a baking sheet and roast for 6-8 minutes, or until they start to turn golden brown.
Remove the hazelnuts from the oven and, using a paper towel or parchment paper, rub them together to remove the skins.
Place the peeled hazelnuts into a food processor and blend for 15-20 minutes until they transform into a smooth, creamy butter.
Add the remaining ingredients, except for the milk or oil, and continue blending until the mixture becomes silky and smooth, resembling Nutella.
If you prefer a creamier texture, gradually add milk or oil while blending until you reach the desired consistency.
Spread your homemade Nutella on your favorite bread, and enjoy!