Preheat your oven to 350°F.
In a 9x13 baking dish, spread about ⅓ cup of the creamy Italian dressing evenly across the bottom. This helps prevent sticking and keeps the chicken moist while baking.
Arrange the thinly sliced chicken breasts in an even layer over the dressing. Season lightly with salt and black pepper.
In a mixing bowl, combine the dry Stovetop stuffing mix, drained Italian-style diced tomatoes, 1 cup of Italian blend shredded cheese, and the remaining ⅓–½ cup of Italian dressing. Stir until everything is well combined. The dressing will moisten the stuffing mix and help it bake up tender rather than dry.
Spoon the stuffing mixture evenly over the chicken breasts, spreading it gently so each piece is covered.
Sprinkle additional Italian blend cheese over the top for that extra melty finish.
Bake uncovered for 20–25 minutes, or until the chicken is fully cooked through and reaches an internal temperature of 165°F.
Switch the oven to broil and broil for 2–4 minutes, watching closely, until the top becomes golden and lightly crispy.
Remove from the oven and let it rest for about 5 minutes before serving. This helps the juices redistribute and makes slicing easier.