Preheat oven to 400°F (200°C).
Lightly grease a standard 12-cup muffin pan.
Thaw puff pastry according to package directions, keeping it cool.
Lightly flour a clean work surface.
Unfold the pastry and gently smooth any creases.
Cut the pastry into 12 equal squares.
Press one pastry square into each muffin cup, allowing corners to extend slightly above the rim.
Cut the brie into 12 approximately equal pieces.
Place one piece of brie into each pastry cup.
Spoon approximately 2 teaspoons cranberry sauce over each piece of brie.
Sprinkle a little finely chopped rosemary over each bite.
Beat the egg in a small bowl.
Brush the exposed pastry edges lightly with beaten egg.
Bake for 15–20 minutes, until puffed and deeply golden.
Allow the bites to cool in the pan for approximately 5 minutes.
Carefully remove them using a small spatula.
Transfer to a serving platter.
Drizzle lightly with honey.
Garnish with additional rosemary if desired.
Serve warm.