Ingredients:
For the cupcakes:
1 cup all purpose flour
1/4 cup cocoa powder
1/4 teaspoon baking soda
1/4 teaspoon baking powder
1/4 teaspoon salt
1 stick unsalted butter, at room temperature
3/4 cup sugar
1 egg
1/2 teaspoon vanilla extract
1/2 cup buttermilk
2 ounces bittersweet chocolate, melted and cooled
12 Ferrero Rocher candies, unwrapped