Preheat the oven to 350°F.
Into the bowl of a stand mixer, add flour, hazelnuts, confectioners, sugar, cornstarch and salt. Mix to combine.
Add in room temperature butter along with Frangelico and vanilla extract. With the paddle attachment, mix the until a dough comes together.
Using a .5 tablespoon cookie scoop, scoop out your cookies onto a parchment lined baking sheet. Roll each cookie in your hand to smooth it out. Place in the refrigerator for 30 minutes.
Bake for 16 to 18 minutes. The cookie should be slightly golden underneath.
place the cookies on a wire rack to cool.
In the meantime, melt the chocolate. Place the chocolate in a microwave safe bowl with coconut oil. Microwave for 30 seconds at a time until the chocolate is melted and smooth. Allow the chocolate to cool it room temperature and thicken up a bit. If the chocolate is too liquidy, it will drip out of the cookie when you try to assemble.