Scoop 1 to 2 tablespoons of hazelnut spread and form into balls. Place in the freezer for 15 to 30 minutes to harden.

Prepare chocolate mug cake ingredients as per package directions. Place the frozen hazelnut balls in the middle of the chocolate mug cake mixture, then microwave it uncovered for 1 to 1 and 1/2 minutes. Remove from the microwave, cover with the lid, and microwave for another 30 seconds to seal the moisture.

Uncover and unmold mug cake, then pipe whipped cream and drizzle with chocolate syrup before serving. Best serve warm.