Preheat your oven to 200°C (390°F) and line a baking sheet with parchment paper.
Roll out the puff pastry slightly on a floured surface to relax the dough, then use a small sharp knife to cut it into 24 small squares, about 2 inches each.
Place each pastry square into a mini muffin tin or directly on the baking sheet, pressing lightly to form a small cup or well in the center.
Slice the brie into small pieces and place a piece into the center of each pastry square. Top with a few cranberries, pressing them gently into the cheese.
Brush the edges of the pastry with the beaten egg to give a golden finish.
Bake in the preheated oven for 12-15 minutes, or until the pastry is golden brown and the cheese is bubbling and melted.
Remove the bites from the oven and let them cool for about 5 minutes; the cheese will set slightly and be easier to handle.
Garnish each with a small sprig of thyme and drizzle with honey if desired for a touch of sweetness.
Arrange the Cranberry Brie Bites on a serving platter and enjoy while warm or at room temperature, perfect for festive gatherings.