Streusel is a yummy crumbly topping that you put on top of cakes and pastries. It's made from flour, sugar, and butter, which are all mixed together to make a grainy texture. Then, sometimes cinnamon or other spices are added to make it taste even better. You can make streusel in different kinds, like chocolate, fruity or just plain and it can be used on different types of sweets like muffins, coffee cakes, and pies. The streusel is usually baked alongside the pastry or cake and gives it a crunchy texture and a sweet, flavorful taste. It's kind of like a delicious little blanket on top of your sweet treats!