This is very basic and super simple. You can add vanilla, sea salt, cocoa and sugar to make a nutella type of butter. Or add cinnamon and honey for a nice sweet spread.
Roast hazelnuts on a cookie sheet in a 375 degree oven for 10-15 minutes.
Load hot hazelnuts into a dish towel and rub nuts against each other to make the skins fall off. Try to get as much of the skin off as you can but don't obsess!
Put the nuts in a food processor or high speed blender and blend tip it becomes a smooth nut butter. Only a few minutes.