Steps
1. Preheat oven to 400°F (200°C). 2. Slice the onions thinly. 3. Heat olive oil in a pan and sauté the onions over low heat until caramelized. 4. Roll out the puff pastry and place on a baking sheet. 5. Spread the caramelized onions on the pastry, crumble goat cheese on top, season with salt, pepper, and fresh thyme. 6. Bake for 20-25 minutes until the pastry is golden brown. 7. Serve warm.