Dijon Chicken w/ Zucchini & Tomatoes

Nonstick cooking spray 1 1

medium zucchini (cut into 1/4-inch rounds) 2 2

grape tomatoes 10 oz 284 g

olive oil 1 tbsp 1 tbsp

black pepper (ground, divided) 1/4 tsp 1/4 tsp

lemon (juiced) 1/2 1/2

Dijon mustard 2 tbsp 2 tbsp

chicken breasts (4-ounce each, boneless, skinless) 4 4

salt (optional) 1/2 tsp 1/2 tsp

garlic powder 1/2 tsp 1/2 tsp

dried oregano (dried) 1 tsp 1 tsp

Parmesan cheese (freshly grated ) 1 tbsp 1 tbsp