In a mixing bowl, combine the heaping cup of Nutella and ½ cup of softened unsalted butter. Use a spatula to mix until the mixture is smooth and well-blended.
Add in the 1 cup of confectioners' sugar and ⅓ cup of cocoa powder. Mix thoroughly to avoid lumps. The mixture should start to thicken as the sugar and cocoa incorporate.
Gradually add ½ cup plus 1 to 3 tablespoons of all-purpose flour to the mixture, stirring until fully combined. The dough should be thick yet pliable. If it feels too sticky, add additional flour one tablespoon at a time until it reaches the desired consistency.
Gently fold in the ½ cup of semi-sweet chocolate chips until evenly distributed throughout the dough.
Cover the bowl with plastic wrap and place it in the refrigerator for about 30 minutes. This will make it easier to handle when forming the truffle bites.
Once chilled, scoop out portions of the dough using a cookie scoop or spoon. Roll them into bite-sized balls and place them on a baking sheet lined with parchment paper.
Dust the truffle bites with additional cocoa powder for an elegant finish. This adds a touch of sophistication and enhances the chocolate flavor.
Return the baking sheet to the refrigerator for an additional 30 minutes to set the truffles.