Preheat your oven to 350°F (180°C). Grease and flour a cake pan.
In a large bowl, whisk together the flour, cocoa powder, and baking powder.
In another bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time.
Add the milk and orange zest, then gradually mix in the dry ingredients until just combined.
Pour the batter into the prepared pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Let cool completely.
Melt the dark chocolate in a double boiler or in the microwave in 30-second intervals. Stir in the heavy cream and powdered sugar until smooth and glossy.
Frost the top and sides of the cake with the chocolate ganache, smoothing it out evenly.
Cover the cake with orange fondant, smoothing it out to create a flawless finish.
Shape black fondant into spiders, bats, or other Halloween-themed decorations and arrange them on the cake.
Affix the edible candy eyes to the decorations or directly onto the cake to create a playful and spooky effect.
Refrigerate the cake for at least one hour to allow the decorations to set before serving.
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