01 - Preheat the oven to 400°F.
02 - Cut four large sheets of heavy-duty aluminum foil, approximately 12x16 inches each.
03 - Place one chicken breast in the center of each foil sheet.
04 - Distribute the sliced bell pepper, yellow squash, zucchini, red onion, and halved cherry tomatoes evenly around each chicken breast.
05 - In a small bowl, combine the olive oil, Italian seasoning, garlic powder, paprika, salt, and black pepper. Drizzle the mixture evenly over the chicken and vegetables in each packet.
06 - Fold the foil sides up and over the chicken and vegetables, crimping the edges to seal each packet tightly while leaving some room for steam to circulate inside.
07 - Transfer the sealed packets to a baking sheet and bake for 25 to 30 minutes, until the chicken is cooked through and the vegetables are tender.
08 - Carefully open each packet, watching out for the hot steam. Garnish with chopped fresh parsley and serve with lemon wedges.