Preheat the oven to 350°F (180°C). Grease and flour a baking pan or cake tin.
Separate the eggs. In a clean bowl, beat the egg whites with a pinch of salt until stiff peaks form.
In a separate bowl, cream together the egg yolks, granulated sugar, and vanilla sugar until light and fluffy. Add the melted butter, orange juice, and grated orange zest.
In another bowl, whisk together the flour and baking powder.
Gradually add the dry ingredients to the egg yolk mixture, then stir in the mashed bananas.
Gently fold in the beaten egg whites, being careful not to deflate the batter.
Pour the batter evenly into the prepared baking pan or cake tin.
Bake in the preheated oven for approximately 30-35 minutes, or until golden brown. Check for doneness with a toothpick; it should come out clean when inserted into the center.
Remove from the oven and let cool slightly before dusting with powdered sugar and slicing to serve.
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