Chocolate Cupcakes

I've had this recipe for a long time, but the original just called for dusted powdered sugar on top. I've been waiting until I remembered to actually write down my own frosting recipe to share, since powdered sugar alone just didn't cut it, in my opinion.

Original cupcake recipe: Cooking Light
Frosting recipe: mine
yield: 12 cupcakes

Cupcakes:
1 cup flour
1/3 cup unsweetened cocoa
1 tsp baking soda
1/8 tsp salt
2/3 cup sugar
1/4 cup butter, softened
2 eggs
1 tsp vanilla extract
1/2 cup buttermilk
1 1/4 oz dark chocolate, finely chopped

Frosting:
2 Tbsp butter, softened
1 1/2-2 cups powdered sugar
1/2 tsp vanilla extract
dash of salt
2 Tbsp milk

1. Preheat oven to 350°.
2. To prepare cupcakes, combine flour, cocoa, baking soda, and salt; stir with a whisk.
3. Combine sugar and butter in a large bowl; beat with a mixer at medium speed until well combined. Add eggs and vanilla, beating well. Add flour mixture and buttermilk alternately to sugar mixture, beginning and ending with flour mixture. Fold in chocolate. Spoon batter into 12 muffin cups. Bake at 350° for 18 minutes or until knife inserted in center comes out clean. Remove from pan; cool completely on a wire rack.
4. To prepare frosting, combine butter and 1 cup of powdered sugar in a medium bowl; beat well with a mixer on medium speed. Add vanilla extract, salt, and 1 tablespoon of milk, mixing well. Gradually mix in remaining powdered sugar and as much of the 1 tablespoon of milk as is necessary until frosting is a good texture for spreading. Top each cupcake with frosting and enjoy!