Chicken and Cheese Tostada's

These were very yummy and easy to make, too. Two of my most important ingredients.
Chicken and Cheese Tostada's
submitted by Michelle
(from Kraftfoods.com)

6 Flour Tortillas
1 pkt. (1-1/4 oz.) Taco Seasoning Mix, divided
1 lb. boneless skinless chicken breasts, cut into 1/2-inch pieces
1/2 cup water
2 large tomatoes, chopped, divided
2 cups Shredded Cheddar Cheese, divided
6 Tbsp. Sour Cream
1/4 cup chopped cilantro

HEAT oven to 400°F. Place tortillas in single layer on large baking sheet; spray with cooking spray. Sprinkle with 1 tsp. seasoning mix. Bake 7 to 8 min. or until tortillas are crisp and golden brown.
MEANWHILE, combine chicken, remaining seasoning mix and water in large skillet. Bring to boil on medium-high heat; simmer on medium-low 5 min. or until chicken is done, stirring occasionally. Add 1-1/2 cups tomatoes; cook until heated through, stirring occasionally. Remove from heat; stir in 1-1/2 cups cheese.
SPOON chicken mixture onto tortillas; top with remaining ingredients.