Preheat oven to 350°F (180°C). Grease and flour a cake pan.
In a large bowl, whisk together the flour, cocoa powder, baking powder, and a pinch of salt.
In another bowl, cream together the butter and sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk. Mix until just combined, then pour into the prepared cake pan.
Bake for 25-30 minutes, or until a wooden skewer inserted into the center comes out clean. Let cool completely in the pan.
Melt the dark chocolate with the heavy cream in a double boiler or in the microwave, stirring until smooth. Let it cool slightly until it thickens but is still pourable.
In a mixing bowl, combine the crispy rice cereal with the chocolate cream. Spread this mixture evenly over the cooled cake.
Garnish the top of the cake with powdered sugar, cocoa powder, or extra chocolate shavings, as desired.
Refrigerate the cake for at least one hour before serving to allow the crispy layer to set.
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