On a lightly floured surface, roll out pastry into a 12-in. square. Cut off corners to make a circle. Spread preserves to within 1 in. of pastry edge; sprinkle with pecans. Place Brie on top; fold pastry over the cheese and pinch edges to seal.
Place seam side down on an ungreased baking sheet. Bake at 400° for 20-25 minutes or until golden brown. Serve warm with toast and crackers.