Broil chicken according to package directions; let cool slightly. Shred chicken, and set aside.
Position knife blade in food processor bowl; add beans and cumin. Process 1 1/2 minutes. Spread mixture over crackers; top with salsa and chicken. Sprinkle with cheese. Place on a baking sheet; bake at 400° for 5 minutes. If desired, garnish with tomato and cilantro.