Chocolate and Raisin WholeWheat Cookies

I'm baking this special cookies with wholewheat flour and Splenda for a special friend who are a pre-diabetic..I found this recipe in my 1000 recipe baking recipes book. Packing for delivery.

Ingredients:
6 oz/175 g butter or margarine,extra for greasing
1 cup of Splenda(sugar)
1 egg
1 tsp baking soda
1/2 cup all purpose flour
1/2 cup of wholewheat flour
pinch of salt
1/4 cup of unsweetened chocolate powder
1 cup of raisin Method:
1;Preheat the oven to 375 F/190 C.Grease a large cookies sheet.Cream the butter and sugar(Splenda) together in a bowl.Add the egg and beat well,using a hand which if preferred.
2;In a separate bowl,sift together the all purpose flour,baking soda and salt,then add in the wholewheat flour.Mix in the egg mixture,then stir unsweetened chocolate powder and raisin.Mix well with a whisk.
3;Put 24 rounded tablespoonfuls of the cookies dough on to the cookies sheet,allowing room for the cookies to spread during cooking.Alternatively,with light floured hands break off pieces of the dough mixture and roll into balls(about 1 oz/25 g each) place on the cookies sheet and flatten them with the back of spoon.Transfer to preheated oven and bake for 16-18 minutes or until the cookies are golden brown.
4;Transfer the cookies to a wire rack and let it cool before serving.

Note:The original recipe used chocolate chips and raw sugar but I can't use those because I'm baking for special diet friend.So I substitute for unsweetened chocolate powder and Splenda.