Place chicken in a bowl and pour in enough Italian salad dressing to coat. Marinate in the refrigerator, 2 to 3 hours.
Preheat oven to 375 degrees F (190 degrees C).
Drain and discard marinade from chicken and season chicken with garlic powder and lemon pepper. Transfer seasoned chicken to a casserole dish. Layer spinach over chicken.
Mix cream cheese, chives, olive oil, garlic, salt, and pepper together in a bowl. Slowly pour chicken broth into cream cheese mixture, stirring until mixture is smooth; pour over chicken and spinach. Cover casserole dish with aluminum foil.
Bake in the preheated oven for 20 minutes. Remove foil and top chicken mixture with mozzarella cheese; cook until chicken is no longer pink in the center and cheese is melted, 15 to 20 minutes.
The nutrition data for this recipe includes the full amount of the marinade ingredients. The actual amount of the marinade consumed will vary.
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