This buttermilk chess pie with its smooth custard filling and crunchy top is easy to make for a classic American dessert.
Preheat oven to 350 degrees F (175 degrees C.)
In a large bowl, combine sugar and flour. Beat in the eggs and buttermilk until blended. Stir in the melted butter and vanilla. Pour filling into the pie crust.
Bake in the preheated oven until filling is set, about 45 minutes.