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Preheat oven to 425°F. Mix Parmesan and oregano in a small bowl; set aside. Roll out pizza dough on lightly floured surface, shaping into an oval about 10x16-inches. Transfer dough to large baking pan sprayed with no stick cooking spray. Brush dough with 1 tablespoon of the olive oil. Sprinkle half of the Parmesan mixture evenly over dough. Top with shredded mozzarella, leaving a 1-inch border for the crust.
Toss tomatoes with 1/2 teaspoon of the remaining olive oil and a pinch of the salt in small bowl. Arrange tomatoes along crust, working down long side of the pizza to resemble the red stripe of a rainbow. Repeat with remaining veggies, olive oil and salt, creating stripes for each color in the following order: orange peppers, yellow peppers, green peppers and finishing with red onion. Sprinkle with remaining 1/4 cup Parmesan mixture.
Bake 20 to 25 minutes or until cheese is melted and crust is lightly browned. Cool 5 minutes before slicing and serving.