Roast nuts in a microwave or an oven. Place them in a bag and crush into small pieces with something heavy, I used s meat tenderizer.
In a bowl, whisk egg together with brown sugar. Mix in peanut butter and nutella.
Fold in hazelnuts, mix to evenly spread nuts.
Scoop small pieces of dough onto a lined baking sheet. Using a for,k press on the tops, lightly, to flatten it out.
Bake cookies at 350F for 8-10 minutes. They maybe soft when they come out, let them cool for just a few minutes.