When melted, add brown sugar, powdered sugar and whole milk. Whisk until smooth, continuing to heat. Bring to a low simmer, stirring constantly, approximately 5-7 minutes.
Make sure to allow it to simmer for 3-4minutes. If not, the sugars won’t totally dissolve and you’ll have grainy fudge.
Remove from heat and whisk in Nutella, vanilla extract and Kosher salt.
Immediately pour into a 8x8 or 9x9 square dish lined with plastic wrap.
Cover and place in the fridge for a minimum of 6 hours to set.
Remove plastic wrap and slice into 1-2 inch cubes.
Store fudge in the refrigerator for up to 1 week.
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