Using a food processor, being careful not to overfill, pulse until desired coarseness.
Time saver: roast and chop enough nuts to fill several freezer bags, then freeze them. Its easier to make the mess once than every time you need chopped nuts. You’ll be glad you did when you’re doing your holiday baking.
Using the slicing attatchment to your free stand mixer or food processer will result in a more slivered hazelnut than chopped.