It is one of the best ways to boost the nutritional value of your baked goods. Hazelnut, Corylus colurna, flour is often used in place of wheat flour and adds a sweet, nutty flavor to foods. Its low carbohydrate level makes it a favorite among low-carb dieters. Hazelnut flour is also naturally gluten-free, making it a suitable option for those with gluten sensitivity or intolerance.