Place oven rack 4 to 5 inches from broiler; preheat broiler to high. In small bowl, stir ¼ cup mozzarella cheese, breadcrumbs, 2 tablespoons Parmesan cheese, parsley and oil. Makes about 1 cup.
Prepare ravioli as label directs; drain.
In medium saucepan, heat cream cheese, milk, garlic powder, salt and pepper over medium heat 4 minutes or until cream cheese melts, whisking frequently. Whisk in remaining ½ cup mozzarella cheese and 2 tablespoons Parmesan cheese; cook 1 minute or until cheeses melt, whisking frequently. Makes about 1¾ cups.
In 8½" x 11" baking dish, spread half the ravioli; top with with 1 cup chicken and ¾ cup cream cheese mixture. Repeat layers with remaining ravioli, 1 cup chicken and 1 cup cream cheese mixture; sprinkle with breadcrumb mixture. Broil casserole 3 minutes or until top is golden brown and bubbly; serve garnished with parsley, if desired. Makes about 6 cups.