Let the sticks cool for at least 5 minutes. Meanwhile, melt chocolate in a bowl (I use the bain-marie technique to melt the chocolate, but you can also microwave the bowl for one minute).
Optional: While chocolate is melting, crush the hazelnuts in very small pieces, either with a knife of using a blender. Place the crushed hazelnuts on a sheet of baking paper and set on side.
To cover the sticks with chocolate, put some chocolate on a sheet of baking paper and roll stick into melted chocolate (tip: keep the bowl of chocolate on the bain-marie so the chocolate doesn't get hard!).
Once stick is covered with chocolate, transfer it to the sheet of baking paper with the crushed hazelnuts (optional), or to a clean sheet of baking paper. Gently roll the stick into the crushed hazelnuts (optional).
Repeat steps 9 and 10 for every sticks.
Let sit for at least 5 minutes before eating, and enjoy!
*To melt coconut oil, microwave for 30 seconds and stir with a spoon.