Is it a cookie? Is it a pie? It's just elegant and delicious.
Preheat oven to 350°F.
Whisk egg, corn syrup, sugar, butter and vanilla in a bowl until smooth. Stir in pecans. Place phyllo shells on a lightly greased baking sheet.
Carefully spoon filling into each shell, filling about 2/3's full.
Bake for 15 to 20 minutes until filling appears set. Cool on pan.