Add the vanilla ice cream to the almost-empty jar chocolate-hazelnut spread. Microwave for 30 seconds. Add the canned whipped cream if using, then cover tightly with the lid and shake vigorously until a thick sauce forms, about 30 seconds.
Serve over ice cream.
Before microwaving a jar of hazelnut spread, be sure that every last bit of foil from the rim has been removed.
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