Self-frosting Nutella Cupcakes

These are blogosphere favorites, and were quick and easy to throw together for tomorrow's holiday potlucks. This version of the recipe taken from Baking Bites...

Nutella Frosted Cupcakes
10 tbsp(140 grams) butter, softened
3/4 cup white sugar
3 eggs
1/2 tsp vanilla
1 3/4 cups (200 grams) sifted all purpose flour
1/4 tsp salt
2 tsp baking powder
Nutella, approx. 1/3 cup

Preheat oven to 325F. Line 12 muffin tins with paper liners.
Cream together butter and sugar until light, 2 minutes. Add in eggs one at a time, until fully incorporated. Don’t worry if the batter doesn’t look smooth. Add vanilla. Stir in flour, salt and baking powder until batter is uniform and no flour remains.
Using an ice cream scoop, fill each muffin liner with batter. They should be 3/4 full, if you’re not using a scoop. Top each cake with 1 1/2 tsp Nutella. Swirl Nutella in with a toothpick, making sure to fold a bit of batter up over the nutella.
Bake for 20 minutes.
Remove to a wire rack to cool completely.
Makes 12.