2 unbaked pie crusts
1 - 1/2 cup dark brown sugar
1 - 1/2 cup white sugar
4 eggs
3 tablespoons flour
3/4 cup buttermilk
1 (4 ounce) stick butter, softened
1 - 1/2 teaspoon vanilla extract

Beat sugars and butter. Add the rest of the ingredients and mix well. Pour into pie shells and bake at 350°F for 40 - 45 minutes.