In a large bowl, whisk together the flour, cocoa powder, sugar, salt, and baking powder.
In another bowl, whisk the eggs, then add the milk, vanilla extract, and melted butter.
Slowly pour the wet ingredients into the dry ingredients, mixing until just combined. Gently fold in the chopped dark chocolate.
Heat the sunflower oil in a deep fryer or large pot to 340-355°F (170-180°C).
Drop spoonfuls of dough into the hot oil, and fry until golden brown, about 3-4 minutes, turning occasionally.
Remove the doughnuts and place them on a paper towel-lined plate to drain excess oil.
Melt the remaining dark chocolate and dip the tops of the doughnuts into it.
Immediately sprinkle the dipped doughnuts with crispy rice cereal, pressing gently to adhere. Let the chocolate set completely.
Dust the doughnuts with powdered sugar and serve fresh for the perfect harmony of crispy texture and rich chocolate flavor.
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