Preheat oven to 375° and grease a mini muffin tin with cooking spray. On a lightly floured surface, roll out crescent dough, and pinch together seams. Cut into 24 squares. Place squares into muffin tin slots. Cut brie into small pieces and place inside the crescent dough. Top with a spoonful of cranberry sauce, some chopped pecans, and one little sprig of rosemary. Bake until the crescent pastry is golden, about 15 minutes.