Toast the hazelnuts at 375°F for 10-12 minutes until fragrant & the skins split
Place the warm hazelnuts in a kitchen towel and rub vigorously to remove some of the skins (not all of them will come off).
Transfer to a food processor (while warm) and puree into a paste (like thick peanut butter).
Melt both types of chocolate chips in the microwave (on 70% power) until smooth, about 1 minute.
Add in powdered sugar. With the food processor running, slowly add the melted chocolate to the ground nuts (scrape the sides if required). Continue processing until smooth. Add oil to reach desired consistency (optional).
Pour the mixture into a jar/container (it will thicken slightly upon cooling).
Source:
spendwithpennies.com