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Preheat your oven to 350 degrees. Line a baking sheet with parchment paper.
Combine the 1/2 cup Nutella, egg and Vanillina in a mixing bowl. Using an electric mixer beat until smooth.
Add in the flour and beat until just absorbed and a dough forms.
Roll the dough into 1 level tablespoon sized balls and place them 2 inches apart on the prepared baking sheet. Using your finger, make indentations in the middle of each cookie. Bake for 10 minutes. Cool completely before filling.
Spoon about a teaspoon of Nutella into the indentations. Top with crushed pistachios or sprinkles. Or both!