Sweet potato pie recipes vary. Many people develop their own recipes. A variant of the old fashioned sweet potato pie ingredients include: 4-5 large sweet potatoes (round potatoes have less strings), 2 eggs, 1 1/2 cup butter or margarine, 1 teaspoon of nutmeg, 1/2 teaspoon cinnamon, 2 teaspoons of vanilla extract and 2 large graham cracker pie crusts. Boil sweet potatoes with skin on, until tender. Remove from heat. In a large bowl, whip potatoes while adding eggs, butter or margarine, nutmeg, cinnamon, and vanilla extract until mixture is smooth. Fill pie crusts until filling is almost level with the pie crust. Bake on 350 degrees until brown. Let cool on baking rack.