Preheat oven to 375 degrees F (190 degrees C).
Yellow Onion (1)
Butter (2 Tbsp)
in a sauté pan on medium-low. Add the onions and cook for about 15 minutes until they are caramelized.
Puff Pastry (1 box)
, roll it out, and cut it into 12 equal pieces. Lay each piece over the top of a hole in the muffin tin.
Brie Cheese (6 oz)
into 12 equal pieces and place one on top of each puff pastry.
Spoon the onions on top of the cheese. Sprinkle each with a small amount of
Fresh Thyme (1 Tbsp)
Bake for 10 minutes or until the pastry puffs and the cheese softens.