1. Heat oven to 375 degrees F. Coat baking sheet with vegetable cooking spray. In bowl, combine pecans, sugar, and cinnamon.
2. On lightly floured surface, unfold piecrust and roll into 12-inch circle. Brush piecrust with water. Spread nut mixture over circle. Using pizza cutter, divide circle into 16 wedge-shaped slices.
3. Starting at curved side of each slice, roll to form crescent. Place 1 inch apart on prepared baking sheet. Bake 20 to 25 minutes, or until golden brown.