Ground turkey can replace ground chicken with minimal changes to the preparation.
For a slightly lighter pickle sauce, use Greek yogurt instead of sour cream and omit the mayonnaise.
Mozzarella produces a mild, stretchy cheese layer. Cheddar, Monterey Jack, or a Mexican-style cheese blend can provide a sharper flavor.
For extra heat, add cayenne pepper or crushed red pepper flakes to the chicken seasoning.
Serve the tacos with shredded lettuce, sliced tomatoes, avocado, or finely chopped red onion if you'd like additional fresh toppings.