This recipe came from "The Produce Bible" and originally called for ricotta, but I thought goat cheese would be a good substitute. The consistency is very quiche-like, and I think that next time I would up the cheese to egg ratio.
1/2 C goat cheese, at room temperature
2-3 C arugula
1/2 small onion, finely diced
Nutmeg, salt and pepper
Preheat the oven to 350 degrees. Line a greased tart pan with the puff pastry. Prick the pastry with a fork, cover with parchment, and fill with baking weights or dried beans. Bake for 15 minutes, remove the weights and parchment, and then bake for another 5 minutes. Set aside.
Heat the olive oil in a pan and sautee the onions until soft. Stir in the arugula until just wilted. Meanwhile, combine the egg and cheese, and season with a little nutmeg, salt and pepper. Leave some lumps of cheese in the mixture. Add the arugula and combine. Pour into the pastry crust and bake for about 25 minutes, or until set.