Garden Chicken Alfredo

Name: Garden Chicken Alfredo
Ingredients: Vegetable oil cooking spray; 1 pound boneless, skinless chicken breasts; 1 zucchini, sliced lengthwise; 1 yellow squash, sliced lengthwise; 1 red bell pepper, sliced lengthwise; 2 large portobello mushroom caps; 1/2 pound whole-grain fettuccine; 4 tablespoons olive oil, divided; 3 tablespoons cornstarch; 1 small onion, diced; 3 cloves garlic, crushed; 2 cups fat-free half-and-half; 1 cup low-sodium chicken broth; 1 cup grated Parmesan, divided; 1/2 cup plain nonfat Greek yogurt; 1 jar (6 ounces) artichoke hearts, drained and quartered; 2 tablespoons fresh parsley