In a small bowl, combine the cracker crumbs, butter, sugar and hazelnuts. Press onto the bottom and up the sides of a greased 9-in. pie plate. Bake at 350° for 10 minutes. Cool on a wire rack.
In a microwave, heat Nutella until melted; stir until smooth. Spread over bottom of crust. Refrigerate.
In a large bowl, beat cream cheese and Nutella until fluffy. Add the confectioners' sugar, milk and liqueur; beat until smooth. In another bowl, beat cream until soft peaks form. Gently fold into cream cheese mixture. Fold in chocolate chips.
Spoon into prepared crust. Sprinkle hazelnuts and chocolate chips over top. Cover and refrigerate at least 2 hours or until chilled.