Preheat oven to 350℉ and line a cupcake pan with 6-8 paper liners.
Mix together Nutella, eggs, and milk until fully incorporated.
Add the remaining cupcake ingredients and mix until just combined.
Divide batter evenly among cupcake liners.
Bake for about 20 minutes.
Cool in the pan for about 5 minutes, then remove to a wire rack to cool completely.
Nutella Buttercream Frosting
Beat butter until soft and smooth.
Add remaining ingredients and beat until smooth.
Pipe or spread the frosting onto the cooled cupcakes and enjoy!
Notes
Sprinkle a few grains of rice into the bottom of each muffin cup before lining to make them easy to remove from the pan and prevent the bottom of the cupcakes from getting greasy.For a thicker frosting, add additional powdered sugar. For thinner frosting, add additional milk.