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Preheat oven to 350°F.
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Spray a 24-cup mini muffin pan with non-stick cooking spray. Place a piece of dough in each cup. Bake for 12-15 minutes or until just set but DO NOT OVERBAKE. I wouldn't bake them more than 15 minutes. They might look like they still soft and not done, but just let them cool and they will firm up.
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Meanwhile, fill a large resealable plastic bag with Nutella. Seal the bag and cut a small corner off to pipe the Nutella into the cooled cookie cups.
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Add sprinkles or candy and serve. They best when enjoyed the first day. Store covered for up to 3 days.