Place the mushrooms on a cookie tray sprayed with oil. Make sure the tops are facing down.
Spread pizza sauce on each mushroom.
Top off with your choice of vegetables/ meats and lots of mozzarella cheese.
Sprinkle some Italian seasoning on top of the pizzas.
Place the tray in the middle rack of the oven and bake at broiled/grill settings for 10 minutes or until the cheese has melted and is slightly golden brown.
Remove tray from oven and top off each portobello pizza with parmesan cheese, additional Italian seasoning and crushed red peppers.
Video
Notes
Use low fat mozzarella cheese or vegan cheese to make these even healthier.