Preheat oven to 400F degrees.
To a large bowl, add the chicken, Greek yogurt or sour cream, taco seasoning, and 1 and 1/2 cups of salsa, and stir to combine; set aside.
To an 9×9-inch baking pan or similar, add the remaining 1/2 cup salsa and spread evenly.
Place half the tortillas on top of the salsa in baking pan.
Top with half of the chicken mixture, half of the tomatoes, half of the cheese, and any optional ingredients.
Repeat layering process using remaining ingredients (tortillas, chicken mixture, tomatoes, cheese, optional ingredients).
Tip – At this point you can wrap in foil and refrigerate for up to 2 days before baking.
Bake for about 20 minutes or until cheese is bubbly and lightly golden.
Optionally top with sour cream, guacamole, or salsa prior to serving.
