Roll out the thawed puff pastry on a lightly floured surface. Cut the puff pastry into 24 squares (about 3 inches each). Press each square into a non-stick mini muffin tin to form small cups.
Place a cube of Brie into each puff pastry cup. Spoon about 1 teaspoon of cranberry sauce over each piece of Brie and sprinkle chopped pecans on top.
Place the muffin tin in the oven and bake for 18-20 minutes, or until the puff pastry is golden brown and the cheese is melted and bubbly.
Top each bite with a small sprig of rosemary or thyme before serving.
Notes
Storage: You can store any leftovers in an airtight container for 3 to 4 days. Enjoy them cold or reheat them in the oven (or toaster oven or air fryer!) for a few minutes until warmed through.