01 -
In a sauté pan, melt the butter over medium heat. Add the onions and thyme stems, and sauté, stirring often, for 15 minutes.
02 -
Add the brown sugar to the onions, and continue sautéing for another 10 minutes, adjusting the heat if the onions are browning too quickly. Remove the thyme stems when done.
03 -
Preheat the oven to 400°F (200°C). Lay out the cold puff pastry on a floured surface and use a 2¼-inch (5.5cm) biscuit cutter to cut out 9 circles.
04 -
Arrange the pastry circles on a baking sheet. Top each circle with a portion of the caramelized onion mixture, then crumble chèvre cheese over the onions.
05 -
Bake for 20 to 25 minutes, until the pastry is golden and crisp around the edges.
06 -
If desired, finish each tart with a light drizzle of extra virgin olive oil and a small sprig of fresh thyme. Serve warm.