Place diced apples in slow cooker. Mix sugars, cornstarch, vanilla, salt and spices in mixing bowl, pour over apples, and stir to coat. Cook on high 2 hours, stirring occasionally until sugar is melted and syrup starts to form. Turn heat to low setting and cook for approximately 6-8 hours.
Ladle into blender in small batches, blending until smooth and pouring out into bowl, repeating until all the apples have been processed. I then can mine in jelly jars using the water bath method.