Heat oven to 400. Spray a baking sheet w/ cooking spray. In a plastic, resealable bg, mix together flour, 1/2 tsp garlic powder, 1/2 tsp cajun seasoning, salt and pepper. In a shallow bowl, mix bread crumbs w/ remaining garlic powder and cajun seasoning. In another shallow bowl, beat egg whites w/ water. Place chicken pieces into plastic bag, shake to coat. Dip chicken pieces into egg mix, then roll in crumb mix to coat. Place chicken on baking sheet, bake 8 min. Turn chicken over and bake another 8 mins.