Preheat your oven to 400°F (200°C).
Roll out the puff pastry on a lightly floured surface.
Cut the pastry into squares, about 3 inches each.
Grease a muffin tin with cooking spray or butter.
Place each pastry square into a muffin cup, pressing it down gently.
Cut the brie cheese into small pieces and place one piece in each pastry cup.
Top with a spoonful of cranberry sauce.
Brush the edges of the pastry with the egg wash for a golden finish.
Bake in the preheated oven for 20-25 minutes until the pastry is golden brown.
Remove from the oven, let cool slightly, and garnish with fresh cranberries and thyme.