In a small saucepan over low heat, combine cornstarch cold water, splenda,soy sauce,vinegar,garlic,ginger and pepper. Simmer stirring frequently until sauce thickens and bubbles.
preheat oven to 425 degrees
Place chicken breasts in a lightly greased 9by13 inch baking dish. Brush chicken with the sauce. Turn pieces over and brush again.
Bake in the oven for 15 minutes turn pieces and bake another 15 minutes until no longer pink. (WHILE BAKING YOU WILL BRUSH WITH SAUCE EVERY 5 MINUTES). (COOKING TIMES MAY BE DIFFERENT DOING TO THE SIZE OF THE BREAST)