This hazelnut and caramel cake is a decadent dessert that is perfect for special occasions. The nutty taste of hazelnuts is complemented by the rich flavor of caramel, making this cake a delicious and indulgent treat. To make this cake, you will need hazelnut flour, eggs, sugar, butter, caramel sauce, and baking powder. Mix all the ingredients together, pour the batter into a cake pan, and bake for 30-35 minutes. Once the cake is cooled, you can top it with more caramel sauce or whipped cream for an extra indulgent dessert.