a mixture made with butter, sugar, flour, spices, and sometimes nuts, that is put on the top of some cakes or breads, or a cake made with fruit and this mixture

apple streusel 苹果糖粉奶油细末蛋糕

Be sure to cover the fruit with plenty of streusel. 确保用大量糖粉奶油细末覆盖水果。