In a food processor or by hand, finely crush cookies. Add cream cheese and mix until evenly combined and Nutella (filling should have a fudgy texture and appearance).

Shape into 36 (1-inch) balls. Freeze 10 minutes.

Meanwhile, set chocolate in a bowl over a pot of simmering water (double-boiler method) or melt in the microwave at 50% power in 30-second increments.

Using a spoon, carefully roll chilled balls in melted chocolate. Place in single layer in baking sheet lined with parchment or a silicone mat.

Sprinkle with crushed hazelnuts if desired. Refrigerate 30 minutes or until firm.