Potato, blue cheese, and caramelized onion tart

Potato, blue cheese, and caramelized onion tart:
thinly sliced red potato
blue cheese
sliced onion
puff pastry

Thaw the puff pastry and cut into squares. In a small pan, cook the sliced onion until caramelized, adding water if necessary. Spread blue cheese over the puff pastry and top with caramelized onion. Place sliced potato on top of the onion and sprinkle with rosemary, thyme, salt, and pepper to taste. Cook at 350 degrees until puff pastry is browned on the edges.