Preheat your oven to 200°C (390°F) and line a baking sheet with parchment paper.
Unroll the puff pastry on a lightly floured surface and gently roll it out to smooth the edges.
Use a round cutter, about 2-3 inches in diameter, to cut out circles from the pastry. Gather the scraps and re-roll if needed to make about 12-15 rounds.
Arrange the pastry circles on your prepared baking sheet. Place a small slice or cube of brie in the center of each circle.
Spoon a teaspoon of cranberries onto each piece of brie, and if using, drizzle with honey and sprinkle with herbs for added flavor.
Brush the edges of each pastry with the beaten egg to help them turn golden and shiny during baking.
Bake in the preheated oven for 12-15 minutes, until the pastry is puffed and golden brown, and the cheese is bubbling.
Remove from the oven and let the bites rest for a few minutes—they will be hot and gooey right out of the oven.
Transfer to a serving platter and garnish with fresh herbs if desired. Serve warm and enjoy the burst of tart cranberries against the creamy brie.