Fix Your Sad, Dry Nutella With A Simple Oil Solution - Tasting Table
Briefly

"The culprit causing your delicious spread to dry out is air. When you open the jar, the moisture inside the spread slowly evaporates."
"Cooking oil can act as a barrier between the Nutella and the air in the jar or the outside world, keeping it smooth for longer."
"Peanut oil is your best bet—cheap, widely available, and has a very neutral flavor, making it the perfect oil for treating Nutella."
"You can also use any oil labeled as 'refined,' such as refined coconut or grapeseed oil, which have been specially processed to remove their natural flavor compounds."
Read at Tasting Table
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