Crumb pie is basically a pie that is topped with crumb topping. All that needs to be done is to make a pie in the normal way and top it with crumb topping .Crumb pie is ready to be served. It is an extremely popular dessert not just in Europe but the rest of the world as well. Crumb pie has indeed come a long way from its humble beginnings to become a popular dish in various corners of the world. Crumb pie is relatively easy to prepare and can be made in a short duration of time.