This hazelnut coffee cake is a perfect breakfast or brunch option. The cake is made with ground hazelnuts, flour, sugar, eggs, and butter. It has a rich, nutty flavor and a moist, tender crumb. The streusel topping is made with hazelnuts, brown sugar, and cinnamon, and adds a delicious crunch to the cake. Serve it with a cup of coffee for a perfect start to your day.
