Cook and shred chicken
Season chicken with taco seasoning, salt, and pepper
Warm tortillas
Chop lettuce, tomatoes, onions, and cilantro
Shred cheese
Slice avocado or prepare guacamole
Heat chicken in a skillet with a little oil or broth
Fill each tortilla with chicken
Add lettuce, tomatoes, onions, cheese, and avocado
Top with salsa, sour cream, or hot sauce
Serve immediately