Preheat oven to 350 degrees F.
Toss broccoli, bell peppers, and mushrooms with garlic powder, balsamic vinegar, and seasoning. Roast seasoned vegetables on a cookie sheet for 30 minutes, turning occasionally and mounding to keep from drying out.
Steam spinach until just wilted.
Spread a thin layer of pasta sauce on tortilla or on top of pita bread, sprinkle soy cheese, and distribute roasted vegetables and spinach.
Bake for approximately 7 minutes or until cheese is melted.