A thin crisp biscuit is a type of WAFER, which is a thin, flat, and crisp cookie or cracker made from flour, sugar, and other ingredients. Wafers are often used as a base for ice cream sandwiches, and can also be eaten alone as a snack. Thin crisp biscuits are usually made with a combination of wheat flour, butter, sugar, and other flavorings. They are usually baked until they become golden brown and crispy.