A Single Crust Pie is a dessert that does not have a top crust. It only has the bottom crust that lines the pie plate and holds the filling. The bottom crust is placed in the pie plate and the edges are trimmed. The edges are then crimped to provide the crust with a finished look. Many times a Single Crust is baked or partially baked before the filling is added. This prevents the crust from becoming too soggy when certain fillings are used. Even though a Single Pie Crust does not have a top crust, it will often have some type of topping added either as part of the pie or as it is served. Some of the common toppings used are meringue and whipped cream.