Graham cracker crust is a style of pie crust made from crushed graham crackers. Graham crackers are a sweet American cracker made from unbleached, whole wheat graham flour. The crust is usually flavored and stiffened with butter or vegetable oil and sometimes sugar. Graham cracker crust is a very common type of crust for cheesecakes and cream pies in America.Variations use crushed cookies or Nilla wafers as substitutes for the graham crackers.