Preheat your oven to 425°F (220°C). Take a half size baking sheet and line it with parchment paper for easy clean-up. Add the cherry tomatoes, zucchini, sliced bell peppers, and red onion.
Once you take the pan out of the oven, add the kalmata olives and sprinkle the feta cheese over the hot veggies and chicken. The heat will soften the feta and make it more flavorful. Garnish with fresh chopped parsley and serve.