Ingredient:

• 1 (9 inch) unbaked pie crust
• 2 cups cooked and mashed sweet potatoes
• 2 tablespoons butter, softened
• 2 eggs, beaten
• 1 cup white sugar
• 1 tablespoon all-purpose flour
• ½ teaspoon salt
• ½ cup buttermilk
• ¼ teaspoon baking soda
• 1 teaspoon vanilla extract