Crowdie is a traditional Scottish cheese that is commonly used in cooking. It is a versatile ingredient that can be used in a variety of dishes such as soups, stews, and casseroles. If you cannot find crowdie, there are several other cheeses that can be used as an alternative. Ricotta, cottage cheese, and quark are all similar in texture and taste, making them great substitutes. Additionally, creme fraîche, sour cream, or Greek yogurt can be used as a replacement in recipes that call for crowdie as a topping or garnish. No matter what substitution you choose, your dish will still be delicious and full of flavor.