Combine first 3 ingredients in a medium bowl, tossing well to combine. Spoon about 1/3 cup chicken mixture onto each tortilla; microwave each taco at high 30 seconds or until warm.
Top each taco with 2 tablespoons tomato, 1 tablespoon cheese, 1 tablespoon avocado, and 1 1/2 teaspoons sour cream; fold in half.
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