Preheat oven to 400 degrees F.
Place cleaned mushrooms on a baking sheet and lightly drizzle both sides with a little olive oil. Sprinkle with garlic powder, basil and oregano, then bake for 5 minutes.
In the meantime, prep veggies and prepare pizza sauce if you have not done so already.
Once par-baked, pull mushrooms out of the oven and top with desired amount of pizza sauce, veggies and a sprinkle of parmesan.
Bake for 15-20 minutes, or until the veggies are mostly cooked.
Serve with fresh basil, red pepper flake and extra parmesan!