Lay the tortillas or flatbreads on 2 large baking sheets. Top each with half the pasta sauce, spreading it up to the edge. Arrange half the salami and mozzarella slices and oregano leaves over the top.
Bake in a preheated oven, 200°C (400°F), Gas Mark 6, for 8–10 minutes until the cheese is melted and golden. Serve garnished with extra oregano leaves.