Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/2  cup           butter -- softened
   2      cups          sugar
   3      tablespoons   all-purpose flour
   3                    eggs
   1      cup           buttermilk
   1      teaspoon      vanilla extract
   1                    unbaked 9-inch pastry shell

Preparation:

Cream butter; gradually add sugar; beating well. Add flour, and beat until smooth. Add eggs; beat until combined. Stir in buttermilk and vanilla; beat well. Pour filling into pastry shell. Bake at 400 F for 5 minutes; reduce oven temperature to 350 F, and bake an additional 45 minutes or until set.