Mushroom and Cheese Tarts

Bahan-bahan (4 porsi)

• all purpose flour, (for rolling)
• One sheet frozen puff pastry ((thawed))
• 1 tablespoon olive oil
• 1¼ pounds thinly sliced mixed mushrooms, (such as cremini, shiitake, and button)
• coarse salt and freshly ground black pepper
• ¾ cup (3 ounces) coarsley shredded Romano cheese
• 2 tablespoons snipped fresh chives