Reduce heat to medium. To same skillet, add zucchini, onion and garlic; cook and stir 4 to 5 minutes or until zucchini is crisp-tender. Add cooked chicken and Alfredo sauce; mix well. Place half of mixture (about 2 1/4 cups) in storage container with lid; cover and label "for Cheesy Chicken Alfredo Pizza". Refrigerate up to 2 days.