Ratatouille Pizza with Chicken

olive oil

Japanese eggplant, halved lengthwise and cut into (1/4-inch-thick) slices

red bell pepper, cut into 1/4-inch strips

small red onion, thinly sliced

sliced mushrooms

dried Italian seasoning

salt

garlic cloves, minced

Italian cheese-flavored thin pizza crust (such as Boboli)

chopped skinless, boneless rotisserie chicken breast meat

preshredded reduced-fat pizza-blend cheese

plum tomatoes, cut into (1/4-inch-thick) slices

Cooking spray

finely chopped fresh flat-leaf parsley