Preheat oven to 350°F (180°C). Line a cake pan with parchment paper.
Cream together the butter and sugar until light and fluffy, then beat in the eggs one at a time.
In a separate bowl, whisk together the flour, baking powder, and a pinch of salt. Gradually add the dry ingredients to the butter mixture, alternating with the milk, until just combined.
Pour half of the batter into the prepared cake pan and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean. While the cake is baking, prepare the punch layer.
Melt the dark chocolate and heavy cream together in a heatproof bowl set over a saucepan of simmering water (double boiler), stirring until smooth. Stir in the punch flavoring extract. Let cool slightly, then spread evenly over the partially baked cake base.
Pour the remaining batter over the chocolate layer and bake for an additional 20-25 minutes, or until the cake is fully baked and a toothpick inserted into the center comes out clean.
Let the cake cool completely before decorating with chocolate shavings or a punch-flavored cream.
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