Preheat oven to 350 degrees. In a mixing bowl, blend together the sweet potatoes, one egg, brown sugar, cinnamon and nutmeg. Spread evenly in the bottom of the piecrust. In a mixing bowl, beat together the remaining egg, egg whites, corn syrup, sugar and vanilla until the mixture is frothy. Stir in pecans. Carefully spoon over sweet potato layer. Bake for 50 to 60 minutes until filling is set around edges or until a knife inserted halfway between the center and the edge comes out clean. Cool and serve.
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