Heat the oil in a frying pan and cook the mushrooms and spring onions for 3-4 minutes, until softened.
Arrange the naan breads on a baking sheet. Spread 1 tsp tomato puree over each one, then sprinkle the dried herbs on top. Share the mushroom mixture between them, spreading it out evenly, then sprinkle with the cheese.
Bake for 5-6 minutes. Serve the pizzas scattered with a few basil leaves, if you like.