- In a bowl, combine chicken, cumin and paprika. 
- In a small bowl, combine crema fresca, mayonnaise, ketchup, lime juice, salt, and pepper. 
- Add small bowl mixture to chicken mixture, tossing gently to coat. Cover and chill. 
- Fill the avocados with the chicken mixture, top each avocado with tomato and sprinkle with chopped cilantro. Serve immediately.