*Test Kitchen Tip:
To make the chocolate-hazelnut spread easier to handle, freeze portions of the spread before using to fill bombolini. Line a baking sheet with parchment paper. Drop chocolate-hazelnut spread in 1 teaspoon portions onto the prepared baking sheet. Freeze for 45 minutes. Fill dough as directed with frozen balls of filling. (Filling will thaw quickly.)
Prepare dough and fill with chocolate-hazelnut spread as directed. Place uncooked balls on a parchment paper-lined baking sheet. Freeze until firm. Transfer to a resealable freezer bag. Seal and freeze for up to 1 month. When ready to use, let thaw in the refrigerator overnight. Deep-fry as directed.