Preheat oven to 375°f degrees. Spray a mini muffin tin with cooking spray. Spread a little flour out onto your counter. Then roll out crescent roll dough and pinch seams together. Cut crescent roll dough into 24 equal-sized squares. Place squares into muffin tin slots.
Cut brie into small pieces and place inside the crescent dough squares. Top with a generous spoonful of cranberry sauce, and a little sprig of rosemary.
Bake until the crescent dough is a light golden brown (about 15 minutes). Then serve warm!
Note: Some folks like to cut off the rind to the brie. This isn't necessary with brie but feel free to remove that additional rind.