01 -
Place olive oil in a large saucepan over medium heat. Add onions and cook, stirring occasionally, until caramelized, about 35 minutes. Season with salt and let come to room temperature.
02 -
While onions are cooling, place goat cheese in a small bowl. Add black pepper and stir goat cheese until soft and easily spreadable.
03 -
Preheat oven to 375°F. Line a baking sheet with parchment paper.
04 -
Place puff pastry on the prepared baking sheet. Spread goat cheese over the puff pastry, leaving a 1/2 inch border on all sides. Top evenly with caramelized onions and sprinkle with thyme.
05 -
Bake tart in the oven until the crust is golden, about 25-30 minutes.
06 -
Let the tart cool for 15 minutes. Cut into approximately 2 by 3 inch rectangles. Serve warm or at room temperature.