Heat a large nonstick skillet over medium-high heat. Add oil to pan. Add eggplant, bell pepper, and onion; sauté 3 minutes or until eggplant begins to soften. Reduce heat to medium. Add mushrooms, and cook 3 minutes, stirring frequently. Add Italian seasoning, salt, and garlic; cook 1 minute, stirring constantly. Remove from heat.
Place crust on a baking sheet. Spread vegetable mixture evenly over crust, leaving a 1/2-inch border. Arrange the chicken over vegetable mixture; sprinkle evenly with cheese. Arrange tomatoes over cheese, and lightly coat with cooking spray. Bake at 375° for 25 minutes or until cheese is bubbly and tomatoes are softened. Sprinkle with parsley.