MAKE 3-inch-long cut in one long side of each chicken breast to form pocket, being careful to not cut all the way though to opposite side. Place chicken in bowl; drizzle with 1/4 cup dressing. Refrigerate 30 min. to marinate.
HEAT oven to 375°F. Mix cracker crumbs, 1/4 cup cilantro, garlic and remaining dressing. Remove chicken from marinade; discard marinade. Spoon about 3 Tbsp. of the crumb mixture into pocket in each chicken breast; place on foil-covered baking sheet.
BAKE 25 min. or until chicken is done (165ºF). Combine remaining cilantro and cheese. Top chicken with tomatoes and cilantro mixture.
