Preheat oven to 275 degrees. Generously butter your pie plate.
Beat egg whites until stiff; add sugar and beat until mixed well. Add pecans and Ritz crackers and stir until well mixed. Spoon mixture into pie pan and cook for 50 minutes.
Take pie out of oven and cool completely. In a chilled mixing bowl beat whipping cream until stiff peaks form. Add sugar and vanilla; mixing well. Spoon over cooled pie and place in refrigerator overnight.