Preheat oven to 350°F and grease 12-cavity donut pan with non-stick cooking spray.
In a large bowl, whisk flour, Splenda Granulated Sweetener, baking powder, pumpkin pie spice and salt together until combined.
In a separate medium bowl, whisk butter, milk and eggs together until smooth. Stir butter mixture into flour mixture until just combined.
Divide batter evenly in a prepared donut pan. Bake until light golden-brown and a toothpick inserted into the center comes out clean, about 10-15 minutes. Transfer to wire rack and let cool for 30 minutes before glazing.
To make the glaze:
Add Splenda Granulated Sweetener, cornstarch and pumpkin pie spice to blender. Blend until sweetener is a very fine powder.
Add water and blend until smooth. Dip cooled donuts into glaze and serve.