- Preheat oven to 400F. 
- Lightly grease a baking dish with cooking spray and set aside. 
- Combine tomatoes, olive oil, onions, garlic, oregano, Italian seasoning and fresh parsley in a mixing bowl; toss to combine. 
- Pour tomato mixture into prepared baking dish. (You can also combine the ingredients inside the baking dish). 
- Season chicken with salt and fresh ground pepper. 
- Place chicken on top of tomatoes; make sure that the chicken is nestled down in the tomatoes so it simmers in the sauce while it cooks. 
- Bake for 35 minutes, or until sauce bubbles and chicken is done cooking. Chicken is cooked when internal temperature reaches 165F degrees. 
- Sprinkle with cheese; bake for 4 to 5 minutes or until cheese is melted. 
- Garnish with chopped parsley. 
- Serve.