Put all dressing ingredients in a blender and blend until smooth. Taste and adjust seasonings. Mix into chicken mixture.
Cover and refrigerate until ready to eat. To serve, layer tortillas with lettuce, tomato, and chicken salad. Fold ends and roll to hold all ingredients inside.
Notes
***I didn't use the avocado in the dressing for this recipe post(I was out and the grocery store near us didn't have any that looked good) :( So, it can be made either way but I just increase the sour cream and mayo by a tablespoon or two to make up for the absence of the avocado.*** A rotisserie chicken works really well for this recipe!