East Texas Buttermilk Pie

1 (9-inch) pie shell, baked
3 rounded tablespoons flour
1 1/2 cups granulated sugar
1/2 teaspoon salt
1/2 cup butter, melted
3 eggs, slightly beaten
1 cup buttermilk
1 teaspoon vanilla extract
Nutmeg, to taste
Cinnamon, to taste

Mix flour, sugar and salt; add to butter. Add eggs, buttermilk and vanilla. Mix and pour into pie shell; sprinkle with nutmeg and cinnamon. Bake at 350 degrees F for 50 minutes. Test with knife. It should come out clean when pie is done.