Preheat oven to 450˚F.
Cut out 4 sheets of foil, each measuring about 12”x12”. Set aside.
In a large mixing bowl combine the chopped chicken, peppers, zucchini, onion, and garlic.
To the chicken mixture add olive oil, paprika, Italian Seasoning, garlic powder, onion powder, salt, and pepper; mix well until thoroughly combined.
Spoon mixture evenly onto the 4 foil sheets.
Fold all sides of the foil over the ingredients and seal it closed.
Transfer the foil packs to a large baking sheet and cook for 20 to 25 minutes, or until chicken is cooked through and veggies are tender. Chicken is cooked through when internal temperature registers at 165˚F.
Remove from oven.
Carefully poke a hole in the top of the packets, to let some of the steam out. Open the packets away from your face because of the remaining steam inside.
Taste for salt and pepper, and adjust accordingly.
Garnish with pepper flakes, if using, and chopped parsley.
Serve.