Streusel

In baking and pastry making, streusel (German pronunciation: [ˈʃtʁɔʏzl̩]) is a crumbly topping of flour, butter, and sugar that is baked on top of muffins, breads, pies, and cakes. Some modern recipes add spices and chopped nuts. The mixture can also be layered or ribboned in the middle of a cake.