Heat oven to 425. Spray a 9" x 13" pan w/ cooking spray. Heat oil in lg skillet over high heat. Add sausage and mushroom, cook 5 mins, stirring often. Stir in tomato sauce, oregano, garlic powder, salt and pepper.
Cook until heated through. Unroll pizza dough. Press dough into bottom and 1/2 way up sides of pan. Line bottom of dough w/ 6 slices of mozzarella cheese.
Top cheese w/ turkey mix. Bake, uncovered 12 mins. Top w/ remaining cheese slices. Sprinkle w/ parmesan cheese. Bake 5 mins, or until cheese is melted.