01 - Set oven temperature to 400°F and allow it to fully preheat.
02 - Cut four large sheets of heavy-duty aluminum foil, approximately 12x16 inches each.
03 - Place one chicken breast in the center of each prepared foil sheet.
04 - Distribute sliced bell pepper, squash, zucchini, onion, and halved cherry tomatoes evenly around each chicken breast.
05 - Combine olive oil, Italian seasoning, garlic powder, paprika, salt, and black pepper in a small bowl. Drizzle evenly over the chicken and vegetables in each packet.
06 - Fold the foil sides up and over the chicken and vegetables, crimping edges to seal each packet tightly while leaving slight room for steam circulation.
07 - Transfer sealed packets to a baking sheet and bake for 25 to 30 minutes, until chicken reaches an internal temperature of 165°F and vegetables are tender.
08 - Carefully open each packet watching for escaping steam. Top with chopped fresh parsley and serve with lemon wedges alongside.