In a large bowl, whisk together the flour, cocoa powder, sugar, salt, and baking powder.
In another bowl, mash the bananas with a fork. Add the eggs, milk, vanilla extract, and melted butter.
Gradually add the wet ingredients to the dry ingredients, then gently fold in the chopped dark chocolate.
Heat the oil in a deep fryer or large pot to 340-355°F (170-180°C).
Carefully 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.
Dust the doughnuts with powdered sugar, and garnish with fresh banana slices and chocolate shavings.
Serve fresh, allowing the perfect harmony of banana and chocolate to shine.
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