In baking, hazelnut oil can be used to replace some or all of the butter or vegetable oil in recipes, imparting a subtle nutty flavor to cakes, muffins, and cookies. It's particularly delightful in chocolate desserts, enhancing the richness of the cocoa. For savory applications, hazelnut oil can be drizzled over roasted vegetables, used as a finishing oil for soups, or incorporated into marinades for meats and fish.