Heat butter in medium saucepan and add the pecans and bourbon. Toast pecans slightly and then set aside to cool.
Cut puff pastry into 3 equal strips. Cut each remaining strip into 3 squares for a total of 9. Grease muffin tin. Place a square in each muffin cup, pressing into bottom and up sides and leaving corners pointing up. Place about 1 tablespoon round of brie in the middle of each pastry. Top with the browned pecans and some sugar. Fold pastry over filling, pressing corners together to meet in center. Brush with egg wash. Bake at 350 for 25-30 minutes until brown.
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