This hazelnut and banana cake is a delicious and healthy dessert that is perfect for those who want to indulge in something sweet without feeling guilty. The nutty taste of hazelnuts is complemented by the sweetness of bananas, making this cake a perfect treat for any time of day. To make this cake, you will need hazelnut flour, eggs, sugar, butter, bananas, and baking powder. Mix all the ingredients together, pour the batter into a cake pan, and bake for 30-35 minutes. This cake is perfect for serving with a cup of tea or coffee.