The cupcakes here, inspired by the squiggly-topped childhood favorite, are plumped up with a chocolaty pudding filling, topped with a ganache glaze, and crowned with elegant chocolate curls. Martha made this recipe on Martha Bakes episode 603.
Preheat oven to 350 degrees. Line 18 standard muffin cups with paper or foil liners. In a large bowl, whisk together flour, baking powder, and salt. In a separate bowl, beat butter with sugar on medium speed until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in vanilla. Reduce speed to low and add flour mixture in 2 batches, alternating with milk. Beat in melted chocolate.
Divide batter evenly among muffin cups, filling each about two-thirds full. Bake until a tester inserted in centers comes out clean, 18 to 20 minutes. Let cool in pan on a wire rack 5 minutes, then remove cupcakes and let cool completely on rack. (Cupcakes can be made ahead up to this point and stored in an airtight container at room temperature up to 2 days.)
Transfer pudding to a pastry bag fitted with a 1/4-inch plain round tip. Insert tip in top of a cupcake and squeeze until cupcake begins to mound. Repeat with remaining cupcakes. Refrigerate until cold, about 30 minutes and up to 1 day. Spoon about 2 teaspoons ganache over top of each cupcake; top with chocolate curls. Refrigerate at least 15 minutes before serving.