Prepare the Green Chile Chicken according to its recipe, cooking it in a slow cooker until fully cooked and tender.
Warm the taco shells according to package directions or briefly in the oven until heated through.
Arrange the warmed taco shells and all toppings (pico de gallo, sour cream, guacamole, salsa, shredded cheese, shredded lettuce, green onions, cilantro, and extra green chiles) on a table or serving area.
Let each person fill their taco shells with the prepared green chile chicken and add desired toppings.
Serve immediately and enjoy.