Preheat your oven to 200°C (390°F). Line a baking sheet with parchment paper for easy cleanup.
Unroll the puff pastry sheet and cut it into 1-inch squares or circles using a cookie cutter or knife. Keep the pastry cold to prevent it from becoming sticky.
Arrange the pastry pieces on the prepared baking sheet, spacing them about 1 inch apart. Lightly brush the tops with the beaten egg for a shiny, golden finish.
In a small bowl, toss the cranberries with honey or maple syrup if using dried cranberries to enhance their sweetness and prevent burning.
Place a small slice of Brie cheese in the center of each pastry square or circle, pressing gently so it stays in place.
Top each Brie piece with a teaspoon of cranberry mixture, pressing lightly to secure it on top.
If desired, sprinkle a tiny pinch of thyme or rosemary on each bite for added aroma and flavor.
Bake in the preheated oven for 12–15 minutes, until the pastry is golden, puffed, and the Brie is bubbling and melted.
Remove the bites from the oven and let them rest for a few minutes until the cheese sets slightly. The cranberries will be glossy and soft.
Serve the cranberry Brie bites warm or at room temperature on a platter, perfect for sharing.