Lay out crescent dough on a cutting board; using a pizza cutter, cut the dough into 24 pieces of equal size.
Press a piece of crescent dough into each section of the mini muffin tin. Top with one small piece of cut brie, one spoon of whole berry cranberry sauce, and a sprig of rosemary.
Bake for 10-12 minutes or until the crescent dough has browned. Remove from oven + enjoy!