In a large standing mixer, mix together all cake ingredients for 2 minutes on medium speed. Scape down the sides of the mixing bowl.
Using an ice cream scoop*, fill each paper liner 2/3 full and bake for 15-17 minutes or until a toothpick inserted in the middle comes out clean.
Allow cupcakes to cool for 5 minutes. Remove the cupcakes from the muffin tin and allow to cool on a cooling rack completely before frosting.*
Nutella Buttercream Frosting
In stand mixer, cream together butter and Nutella until smooth.
Add in powdered sugar a little at a time and blend until smooth.
Add in milk, one tablespoon at a time to create a smooth consistency.
Place frosting in a piping bag with your tip of choice. Pipe frosting over cupcakes.*
Sprinkle cupcakes with mini-chocolate chips or other decorative garnish.
Notes
*Instruction that I added for clarity.Always sift the powdered sugar prior to measuring. The frosting may seem thick and dry, but will smooth out when you add the milk. The recipe says it makes 12 cupcakes, but usually get 15 cupcakes from the recipe.