Preheat oven 425*. Grease a donut pan with melted butter or cooking spray.
In a medium mixing bowl combine flour, yeast, baking powder, salt, apple pie spice and ginger. Set aside.
In a large bowl whisk together melted butter, apple sauce and sugar.
Once combine add in eggs and mix until combine.
Whisk in milk until combine.
Slowly stir in the flour mixture to the wet mixture until just combine, do not over mix.
Using a spatula fold in apples and walnuts.
Pour batter into a large piping bag or zip-lock bag and set on top of warm stove for 15-20 minutes to rise slightly.
Snip corner of the piping bag and pipe batter into the donut pan.
Place in oven and bake for 8-9 minutes.
Remove from oven and let cool slightly.
Melt topping butter and set aside.
In a small bowl combine topping cinnamon, sugar and pinch of salt.
Brush donuts with melted butter and sprinkle with cinnamon sugar mixture.
Best eaten same day made.