2. Heat large nonstick skillet over medium-high heat 1 minute; coat with cooking spray. Add vegetables; stir-fry 4 to 5 minutes or until crisp-tender.
3. Place pizza crust on large baking sheet; top with pizza sauce. Sprinkle pepper flakes over sauce, if desired. Arrange vegetables over sauce; top with cheese.
4. Bake 12 to 14 minutes or until crust is golden brown and cheese is melted. Cut into 8 wedges.