Preheat oven to 350 °F
Chop half of the blueberries and leave the rest whole.
Place blueberries into a small bowl and toss with the Walden Farms Blueberry Syrup.
Add 1/4 cup of the Splenda to the blueberries and toss. Set aside.
Sift the flour, baking powder and salt into another bowl.
In a large mixing bowl, cream the butter.
Add the eggs, egg whites, vanilla extract and sweetener and continue mixing.
Mix in the flour and the milk, on low speed, alternating between the flour and the milk.
Fold in the blueberry mixture.
Divide between 12 lined muffin tins.
Bake fo 18-20 minutes, or until a toothpick comes out clean when inserted int the center.