If you're a coffee lover, this hazelnut coffee cake is the perfect dessert for you. Made with hazelnut flour and espresso powder, this cake has a rich coffee flavor that is complemented by the nutty taste of hazelnuts. To make this cake, you will need hazelnut flour, eggs, sugar, butter, espresso powder, 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 coffee or espresso.