Chilli flakes, also known as crushed red pepper, are a condiment consisting of dried and crushed red chili peppers. They add heat and a spicy kick to a variety of dishes, making them a popular ingredient in many cuisines around the world. The level of spiciness can vary depending on the type of chili used. Chilli flakes are commonly sprinkled on pizzas, pastas, soups, and used in marinades and spice blends.