Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper.
Unroll the crescent dough and separate it into triangles.
Place a spoonful of pizza sauce on each triangle.
Top with mozzarella cheese and pepperoni or sausage, if using.
Fold the triangle over to form a pocket and seal the edges with a fork.
Sprinkle with Italian seasoning and Parmesan cheese.
Bake for 12-15 minutes, or until golden brown.
Let cool slightly before serving.