Arugula and Prosciutto Tortilla Pizzas

Directions

1. 1
   Preheat oven to 400F.
2. 2
   In a medium heavy skillet cook prosciutto and onion in oil over moderate heat, stirring, until onion is softened.
3. 3
   Remove skillet from heat and stir in arugula and salt and pepper to taste.
4. 4
   Arrange flour tortillas on 2 baking sheets and top with arugula mixture and Parmesan.
5. 5
   Bake pizzas on upper and lower racks of oven, switching positions of baking sheets halfway through baking, until edges are golden, about 10 minutes.