Boneless chicken thighs can replace chicken breast. Cut them into similar-size pieces and always cook the chicken to a safe internal temperature.
Sweet paprika creates a milder flavor, while smoked paprika gives the casserole a deeper, smokier finish.
Mozzarella can replace Monterey Jack if necessary. Cheddar can also work for a sharper cheese flavor.
For extra vegetables, add diced bell peppers or mushrooms. Keep in mind that mushrooms and zucchini both release moisture during baking.